Miranda tells Carrie that she's pregnant from having unprotected sex with Steve and his one ball. Miranda doesn't want the baby and doesn't want to tell Steve. Charlotte, however, can't seem to get pregnant no matter what bedroom techniques she tries. When she finds out that Miranda is pregnant and is going to have an abortion, she's so upset she storms away. Carrie and Samantha admit that they've both had abortions - Carrie after a one-night stand with a waiter in the '80s. Carrie tells Aidan about Miranda and swears him to secrecy. Aidan is appalled that Miranda isn't going to tell Steve. Carrie lies to Aidan about having had an abortion herself.

Samantha has lunch with Lucy Liu, hoping to represent her. They hit it off and Lucy tells Samantha that she refuses to be lied to. Samantha also has her eye on the coveted Hermes red "Birkin" handbag. Unfortunately, there's an eternally long waiting list, so Samantha uses Lucy Liu's starpower to score a bag. When Lucy shows up at their next lunch carrying the "free" bag, Samantha tells her it's actually for herself. Lucy is furious, fires Samantha and walks off with the bag.

Charlotte sees a fertility doctor and finds out that she has only a 15 percent chance of conceiving naturally. She bumps into Miranda on the street, tells her the news and walks away from the unhappily pregnant Miranda. Carrie accompanies Miranda to have her abortion. While they're waiting Miranda becomes increasingly worried that she's not making the right decision. She wonders if this is her only chance to have a baby. She decides to keep the baby and the girls, including Charlotte, gather around her and support her decision.

Carrie returns to the restaurant where she had met Chad, the waiter who had gotten her pregnant years ago. He's still there and doesn't remember Carrie. She realizes she made the right decision and leaves. Carrie decides to be honest and admits to Aidan that she had an abortion when she was 22. She was worried that he would criticize her, but Aidan is non-judgemental.

As Aidan and all his stuff officially move into Carrie's apartment, Carrie starts feeling increasingly claustrophobic. Carrie complains to the girls that without any private space, she can't indulge in SSB or "secret single behavior." Carrie, Miranda and Charlotte tease Samantha about her affection for her client and lover Richard. Samantha insists that her emotions are intact and that Richard is simply "Dick-alicious." Miranda, meanwhile, would love to get laid by her blind date, Walker Lewis, but is conflicted about having sex while pregnant. She wonders if it's her last chance for sex.

Carrie panics when she finds out that she and Aidan won't be able to take over the apartment next door for another month. When Aidan proposes cleaning out her closet, she panics even more. As she watches Aidan move her precious Manolos and designer garb and when Pete starts gnawing on one of her stilettos, a heated argument ensues. After much yelling, Carrie storms out with her laptop and wonders: When it comes to relationships, what are we fighting for? Things aren't much better in the shaky marital abode of Charlotte and Trey. When Trey brings Charlotte a surprise present - a cardboard baby, Charlotte is appalled and also storms out. Carrie and Aidan's silent war lasts three days without any apologies.

Meanwhile, Samantha meets Richard and is taken aback by the romantic scene he's set up. She reminds him that they're about work and sex and nothing more. After some skinny dipping and hot sex, Richard asks Samantha to dance. She tries to make it sexual, but Richard resists and Samantha gives in.

Carrie finally apologizes to Aidan and confesses that she needs him to not talk to her for one whole hour. He agrees but after a minute she returns to him, realizing that sometimes when you get your needs met, you don't need them anymore. Miranda decides