After losing her virginity to Ricky Underwood at band camp, Amy Juergens discovers that she's pregnant. As Amy contends with her family life, and struggles to come to terms with her pregnancy, she seeks solace from her friends, Lauren and Madison. Meanwhile, Grace Bowman, the most popular girl at school, promises abstinence to her parents.

Amy goes on a date with Jimmy. Meanwhile, Ashley pursuades George to vist Anne to rekindle their relationship, and Griffin sends his cousin Grant to get to know Ashley. Ben visits Grace and tells her that he wants to be friends, and as he leaves, they kiss. At the same time, Amy and Jimmy kiss. After George knocks on Anne's appartment door, Josh answers and explains Anne is with Mimsy and might come back home. While Ricky encourages Amy not to get caught up with Ben and Grace, Adrain's parents tell her they will get married, therefore causing her mom not to take the job offer in New York. Anne tells Ashely that she doesn't think it would be good for her to return home.

Ricky and Amy decide to run off together to escape all the drama at home with Anne's recent announcement that she's gay and Ashley's return home. But, will they decide to say 'I Do'? Meanwhile, Ben struggles with the knowledge that he may have contributed to burning down Dylan's school. And, now that Adrian is done with summer school and graduated, she's looking forward to college and Grace makes some difficult decisions about her relationships.

Lauren and Madison accidentally reveal Ricky's involvement with Amy to the school. Meanwhile, Grace is torn between forgiving Jack and moving on, and Amy experiences her first bouts of morning sickness.

Ben continues to pine after Amy, which results in them sharing their first kiss. Later, Amy shares the news of her pregnancy with Ashley—leaving their parents in the dark. Elsewhere, Adrian believes that Ricky is just using her for sex.

Ben's clingy behaviour begins to annoy Amy, who is also struggling to cope with her family life. Meanwhile, Jack seeks comfort from Adrian after his plans to see Grace fall to pieces.

Amy contemplates adoption for her unborn child. Meanwhile, Ashley and Amy attempt to persuade their father to not leave town, and Jack and Adrian grow closer.

Amy shares the news of her pregnancy with her mother, Anne. Later, Amy's absence from school sparks a rumour that she's having an abortion.

Ricky wrestles with the consequences of his actions. Meanwhile, Grace experiences difficulties with Tom, and Ben and Amy's relationship begins to sour.

Amy and Ashley's grandmother visits. Elsewhere, Adrian flaunts her budding friendship with Grace.

George bonds with Amy and Ashley. Elsewhere, Tom hires a "friend" for the night, and Lauren is caught kissing Ricky.

Amy faces her first day back at school, while Cindy Lee encourages Adrian to foster a relationship with her father.

Adrian's father calls the police after she disappears from school. Elsewhere, the school learns of Ricky's visits to Dr. Fields, Grace is pressured into wearing her purity ring, and Ben and Amy consider having sex.

Assisted by their friends, Ben and Amy marry in secret. Meanwhile, Tom asserts his independence after meeting a new girl.

The parents of Ben and Amy learn of the wedding, and the news leads to a brief reunion by George and Anne. Meanwhile, Adrian's father is bent on finding out who created the fake ID's.

Ricky's father comes to town with some advice for him on how to be a parent.

Amy has the opportunity to find out the sex of her unborn child. Meanwhile, Jack does community service and believes that he sees Bob violate his parole.

Amy and Ricky consider adoption as a possible option. Meanwhile, George's co-worker shows interest in adopting Amy's baby.

Ben and Amy's relationship hits a rough patch when Ben tells her that he needs some space. Amy is angry and sad at his decison and decides to give him a ring that she gets from Ashley in order to prove to him that she accepts him for who he is and loves him. Ashley and her argue and Ashley accuses her of wanting to give up the baby so that she can keep Ben. Ben has doubts about his relationship with Amy and thinks that she still has feelings for Ricky. Jack and Shawna argee to see each other. Lauren and Madison stand by Amy and Alice and Henry stand by Ben. Adrian and Grace argue over Ricky and get into a catfight, but become closer to each other as a result. Elsewhere, Grace's parents apologize to each other and Anne and George interview people who are interested in adopting Amy's baby,but George makes them leave before Anne gets a chance to talk to them because they want a closed adoption rather than an open adoption. Meanwhile, Ricky apologizes to Amy for him accidentally breaking up her and Ben. He talks to her about Ben and the baby, Amy gets upset, and Ben, Adrian, and Grace catch Ricky and Amy hugging. George's gay co-workers come by and talk to George and Anne about them wanting to adopt Amy's baby, and Amy agrees. Ricky tells Jack that he is through with both of Adrian and Grace for good and wants to be with Amy. Amy tries to pay Ben a visit but Ben's father intervenes."

Ashley tries his best to get Amy and Ben back together again, whilst Rick tries to sabotage the adoption process.

Adrian wants to mix things up a bit and tries to change her look, Jack is still bringing out his thoughtful side by raising money, and Anne might soon be off the unemployment list.

Amy gets help from her friends on what to do about the baby.

As Amy's due date inches nearer, Grace and Adrian decide to throw a baby shower for her. While preparing for the party, Jack and Grace have a moment where they reconnect.

Amy goes into labor and she and Ricky keep looking back to when they first met at band camp and how Ricky charmed her into having sex with him. Tom tries to get Jack and Grace together again, and Adrian discovers she still cares for Ricky.

Amy has trouble adjusting to life as a mom as she gives birth to her baby. Meanwhile, Ricky likes fatherhood and becomes friends with Ben; and Anne is surprised when George and Ashley decide to move out.