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One Night Stand Pregnancy

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Two characters have a fling together. They usually expect that to be it, however a while later the woman finds out she is pregnant.

Abortion will probably be brought up but almost never performed. A Convenient Miscarriage might occur, but more than likely the infant will be born.

This can turn out multiple ways for the father: he never learns that he fathered a kid (or doesn't learn until years later), he is a Glorified Sperm Donor who isn't in the kid's life, the parents end up co-parenting, he ends up with a Doorstop Baby and the mother runs away, or he might even begin dating the mother of his kid. In the latter case, this often results in a Shotgun Wedding. In some cases, the father might want the baby but not the mother, which complicates things further.

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Sub-Trope of Law of Inverse Fertility. Often related to Abandoned War Child, Your Cheating Heart, Chocolate Baby, Can't Get Away with Nuthin', Shotgun Wedding, and Heroic Bastard. Compare to Child by Rape for another, less consensual, instance of characters getting easily impregnated.


Examples:

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     Anime & Manga 

     Comic Books 
  • In The Sandman, Hazel McNamara had sex with a male co-worker and ended up getting pregnant as a result. Since Hazel is a lesbian and is woefully naive, she erroneously thought that having sex while standing up would prevent her from getting inseminated.
  • Y: The Last Man: On his adventure as the last living male on Earth, Yorick meets a woman named Beth (the same name as his missing girlfriend) and has a one night stand with her before moving on. When Yorick's sister and her group come by trying to track him down, they find a heavily pregnant Beth and immediately realize what happened.
  • In Love and Rockets the basically lesbian Hopey gets pregnant after a drunken MFF three-way with a couple of her bandmates. She eventually has what she claims is a Convenient Miscarriage, but we only have her word for it.
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     Fan Works 
  • In the Lyrical Nanoha fanfic Infinity, Megane states that her daughter was born from a one night stand with a coworker. The implied father (Zest) is unaware that Lutecia is his child, and presumably never learns the truth given the fact that the fic takes place less than a year before his canon death.
  • In The Little Cherub series, Raven falls pregnant after she and Beast Boy have sex while drunk. She runs away, and only returns with their kid a few years later. Her and Beast Boy start a relationship, have three more kids (none exactly planned for, though very much welcome), get married... come seven years later, and Raven is pregnant again despite strict birth control.
  • In Sotto Voce: Impa's mother Tikala conceived her from a rebound fling after she had her heart broken by Zelda's mother, the previous Zelda.
  • In Unexpected Surprise, Ladybug and Chat Noir have a one night stand and she falls pregnant. What makes it particularly twisted is that 1) neither know each other's secret identities, 2) they soon break up due to Ladybug loving another, 3) they both have to give up their Miraculouses a few days later and 4) Adrien moves to the USA at the same time. The result is that, after a six year long absence, he returns to discover there is a girl about whom three people know she is the daughter of Ladybug and Chat Noir, but the only one to have figured out she is the daughter of Marinette and Adrien is Gabriel.
  • In All My Kittens, two of Duchess' three kittens are the result of fling with a stray. This explains why her sons look so different from her and her daughter.
  • Subverted with Raya in The Ripple Effect. She reunites with Luis (her love interest from the episode "Aztec Enchantment") while in Mexico. They end up going on a romantic date and have sex together before Raya returns to California. A few months later, Raya finds out she's pregnant. She calls Luis, who ends up moving to the US with her to take responsibility. Right after their daughter is born, Luis proposes to Raya.
  • RWBY: Scars explains that Yang was the result of this. Raven was in love with Summer but it was unrequited. She had sex with her other teammate Taiyang and ended up pregnant. Despite Incompatible Orientation, the two tried to settle down. It worked for a while but Raven left because her mother passed, leaving Raven the next leader of their tribe.
  • The Line Is Not Broken is a Naruto oneshot where Tsunade is secretly Minato's mother, conceived with Jiraya through a drunken one-night stand. She never told Jiraya about the pregnancy and doubts he even remembers them having sex. Tsunade gave Minato up for adoption and never told anyone about him but her teacher Sarutobi.
  • In the Fairy Tail fanfic The Spirit Doll Nashi was the result of one night between Lucy and Natsu before he took off for his year of training. Over seven years later Natsu is left in shock when he finds out that the urchin girl his team picked up is Lucy's daughter that he comes to the obvious conclusion that he is her father.
  • Chaos and the Aftermath: Samus gets pregnant with a fling on a random planet. She can't remember the man's name, face, or even what planet she was on at the time. Samus ends up getting an abortion because the cons of a pregnancy in her line of work outweigh the pros.
  • You Are My Sunshine has Tony Stark and Mary Fitzpatrick having a one-night stand that leads to the birth of their son, Peter. Tony is unaware of this until five years later, after Mary has died in a car accident and her friends reach out to him.
  • Give In, Give In [and Relish Every Minute of It] starts with Frollo finding out he fathered a son from a fling fifteen years ago. His son, Quasimodo, comes to live with him after his mother and step-father are killed. Frollo can't even remember the face of Quasimodo's mother.
  • Leona and Qrow from Little Bird are more than acquaintances but aren't in a committed relationship, more akin to Friends with Benefits than anything. They see each other when Qrow drops in town, However, Qrow hadn't visited Leona in over two years, so he wasn't aware of her pregnancy.
  • Matt Murdock and Jessica Jones in born of hell('s kitchen) had a drunken hook-up in a janitor's closet, causing their son Peter's conception. Jessica only remembered the father was named Matt and was so completely wasted she still can't believe he managed to knock her up, so she didn't inform him. Matt only learns he's a dad when he runs into the six-year-old Peter at his workplace.
  • Cabin Fever:Promises To Keep follows the notorious one night stand between Paul and Marcy, but changes the subsequent events so that Marcy survives, although Paul still dies. Unsurprisingly, Marcy's decision to not bother with a condom has consequences and, after returning home to safety, she discovers she has become pregnant with Paul's child.
  • The Bolt Chronicles: In "The Survivor," Jack and Emily hastily get married because of the latter's unexpected pregnancy, occurring shortly after they begin dating.

     Films — Live Action 
  • Early into Titanic (1953), Richard learns that his 10-year old son was fathered by another when his wife had a fling after they had a fight.
  • The MTV movie Jailbait starts off with the male lead impregnating an underage girl during a one-night stand.
  • In I Am Sam, Sam's daughter was the result of a fling. Her mother ran off and left her with her dad.
  • The premise of Knocked Up, where Allison gets pregnant after a one-night-stand with Ben and the film explores their relationship through the following nine months.
  • Obvious Child. The protagonist has a drunken one-night stand with a stranger after being dumped by her boyfriend and gets knocked up. The rest of the film is about her finding the father, starting a relationship with him, and getting an abortion.
  • Citizen Ruth: Stoops is an insolvent indigent that resorts to one-night stands just to get a bed for the night. One of her johns gets Ruth pregnant, and a magistrate orders Ruth to terminate her pregnancy, or face felony charges, since Ruth's four other children were rescued by the state from Ruth's neglect. This puts Ruth in a tug-of-war between pro-choice and pro-life activists.
  • The Terminator: Kyle Reese and Sarah Connor only spend one night together and conceive the future savior of the human race. They probably would have stayed together long if Kyle had lived long enough. John, their son, confirms that it was only one night in the second film, remarking that his mother is still in love with Kyle and often cries about his death.
  • The Rock: John Mason's daughter, Jade, was the result of a one-night stand after a Led Zeppelin show in the early 1970s.
  • In Oblivion (2013), Julia has sex with Harper one time and gets pregnant that night, leading to Someone to Remember Him By after Harper dies.
  • Love, Rosie: Rosie gets pregnant due to a tryst with her date Greg after a dance. After she tells him about the pregnancy, he immediately runs off.
  • The Birdcage: Armand's son Val is the result of a one-night "Let's See What Those Straight Guys Are Raving About" affair with a woman he was appearing in a play with.
  • Admission: Portia was conceived this way. Her mom had a brief tryst while on a train with a stranger. She initially claims it was precisely to get pregnant, but then comes clean that this was accidental.
  • What to Expect When You're Expecting: Rosie got pregnant due to an impulsive, one time tryst with Marco.
  • Vox Lux: Celeste got pregnant with Albertine due to a one-time tryst.
  • Stardust: Tristan's parents only have sex once, but she gets pregnant and his father learns about this when he's sent for him to raise.

     Literature 
  • The Alice Network: Charlie gets pregnant as a result of one of her many one-night stands with random boys.
  • Melissa's deadbeat dad from I Am J was a musician who was in town for a show. Melissa's mother tracked him down for child support but he otherwise isn't in their lives.
  • In the Renegade X series, Damien Locke was conceived out of wedlock by his mother's one-night stand with a superhero.
  • Cat Pack:
    • Implied with Carlotta. She has kittens with an unspecified he-cat but the cat is never mentioned. It wasn't a planned pregnancy either as Carlotta's afraid that her owner will react negatively to her kittens.
    • It's implied that Texas Jake was an unwanted pregnancy from a fling. His mother didn't want children and abandoned her litter when they were old enough to fend for themselves.
  • Stardust: Tristran was conceived when his father, Dunstan, had a one-night stand with one of the stallholders at the annual fairy market. She left baby Tristran with Dunstan the following year since her life situation was not conducive to raising a child. Dunstan went on to marry a local woman and although Tristran later finds his mother, she and his father don't get together.
  • Warrior Cats:
    • In Bluestar's Prophecy, Bluefur and Oakheart, who had feelings for each other, decided to sneak out to spend one night together, but then Bluefur decided that her loyalty to her Clan was more important and that that one night would be their only one. Bluefur becomes pregnant shortly afterward. Oakheart originally planned to join ThunderClan to be a father to his kits. Bluefur realized that if she was nursing kits when the deputy position became vacant her Warhawk Clanmate Thistleclaw would be chosen instead, so once they were born she gave her kits to Oakheart to be raised in RiverClan.
    • Fans suspected Spiderleg and Daisy of having a one-night stand when the characters suddenly have kits after barely speaking together. Even then, he barely looks at her and is incredibly awkward around the kits until others criticize him for not being a good father to them. The authors have confirmed that this is indeed the result of the characters having a one-night stand.
  • The Forgotten Beasts of Eld: Sybel's father was conceived this way, according to the introduction, being the result of a tryst in the city.

     Live-Action TV 
  • Accidentally On Purpose: This is the main plot, where the main character Billie falls pregnant via one night stand with a younger man named Zack.
  • Pramface: Laura ends up pregnant with Jamie's baby due to a tryst they had during a party.
  • On Timeless, the man who killed Wyatt's wife Jessica was conceived in a one-night stand. Wyatt then gets the idea to go back in time and prevent her murder by preventing the killer's conception. He succeeds, but Jessica still dies.
  • In the finale of How I Met Your Mother, Barney's one night stand only identified by a number drops a baby daughter on him. He's happy to have the baby in his life, but nothing is known of her mother. Was she ever involved in her daughter's life? Riddle for the ages.
  • Life Unexpected: Cate and Baze conceived Lux this way while they were in high school. Baze assumed Cate had an abortion-in fact, she gave Lux up for adoption, who fifteen years later contacts them.
  • Gotham: At Jim's lowest point in Season 5, he sleeps with Barbara. As a result, she gets pregnant with their baby.
  • Ash vs. Evil Dead: Ash learns he has a daughter due to a long-ago one with a woman in town. Then the mom is killed off by Deadites on the same day he learns this, so he's now her only parent. Since Ash is a Hero with Bad Publicity, father-daughter time is difficult.
  • Nip/Tuck: Christian Troy is told by a woman he used to sleep with that he impregnated her, only for it to turn out to be a Chocolate Baby. The boy's actual father is a traveling businessman who only slept with her once, and is otherwise deeply religious, thus regretting his mistake seriously. Nevertheless, he and his wife decide to raise the child together after a custody dispute rules out both the mother and Christian himself.
  • Hell on Wheels: Cullen Bohannon impregnates a Mormon girl after a single tumble in the hay (of course, she's around twenty, meaning she's at her most fertile). When he finds this out, he's a captive of the Mormon colony for separate reasons, so he's forced to agree to a Shotgun Wedding.
  • Without a Trace's Samantha conceives her son this way. Despite the fact that she couldn't even remember the guy's name when they woke up the next morning and needed to use her job skills (she's an FBI agent) to track him down, she not only doesn't terminate the pregnancy, they end up co-parenting and the series concludes with them deciding to make their "relationship" work. (The Reality Subtext is that the actress was pregnant in Real Life and the guy playing her baby's father was her boyfriend).
  • World on Fire: Lois and Harry have sex once, from which she gets pregnant.

    Music 
  • Heart's song "All I Wanna Do Is Make Love To You" is sung from the viewpoint of a woman who picks up a hitchhiker for a one-night stand. The closing lines reveal that she is now a mother to his child, and that she had intended from the start to get pregnant this way because her husband is sterile.
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     Religion 
  • The Bible: In the Book of Genesis, Tamar had one with her father-in-law Judah by disguising herself as a prostitute in order to have a child from him when Judah wouldn't give his surviving son Shelah to her as a husband. Tamar had Judah give over some signature items as collateral for payment of her services, and would later use them to prove that Judah was the father of her children when Judah heard that Tamar was pregnant through prostitution and demanded that she would be brought to be burned to death.

     Theatre 
  • Love Never Dies: Christine’s son Gustave was conceived this way. The night itself and the resulting consequences are discussed on two separate occasions in the songs Beneath A Moonless Sky and The Phantom Confronts Christine.

     Video Games 
  • This trope occurs at least twice in the Assassin's Creed franchise.
    • Clay Kazmarek is the descendant of one of Ezio Auditore's many illegitimate children. The dude was quite the charmer.
    • It is eventually revealed that Desmond himself had a kid after a one-night stand at eighteen, fathering a son. He died before he knew about it.
  • In Baby Bump, Chapter 1 is a How We Got Here between the main character Jen Cassidy and her future baby's father Clint Covington having had one of these after escaping from some rather aggressive and drunk groupies of his.

    Webcomics 
  • Durkon ends up sleeping with Hilgya during the first story arc of The Order of the Stick, which much later on is revealed to have gotten her pregnant (she actually wanted to pursue a relationship, but he rebuked her when she revealed that she was already married).
  • El Goonish Shive: Adrien Raven turns out to have fathered Diane during a one-night stand. He thought he was sterile at the time, and didn't find out the truth until almost twenty years later.
  • Stand Still, Stay Silent: According to the author, this is the reason the grandfather shared by Onni, Tuuri and Lalli has Only One Name in the official family tree of the cast. The twins sons from that night are apparently the only children their grandmother ever had, and the twins eventually fathered three children between them.
  • Jodie from Loserz.

     Web Original 
  • The series Talking Kitty Cat reveals Random Kitty and Gibson had "bumped fluffy butts", as their owner Steve put it. The reasons it was a permanent one night stand was because Gibson died during the episode's production and Random presumably got spayed after having her kittens.

     Western Animation 

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