Season 1 - 2. The One With The Sonogram At The End

Ross's ex-wife, Carol, tells him she is pregnant and wants to give the baby both her and her female lover's last names, but not Ross's. Monica goes on a manic cleaning spree to impress her parents, who favor Ross. Phoebe notes, "You're all chaotic and twirly--and not in a good way." Meanwhile, Rachel finds out that the man she left at the altar went on "their honeymoon" with her maid of honor, Mindy.