Coronation Street: What went on between Tracy and Haley?

For a bet with Bev Unwin, Tracy Barlow spikes Roy's drink at a wedding reception. She then takes him home and puts him in her bed. Tracy later announces she is pregnant with his child. Hayley is devastated and after she leaves Roy, he contemplates suicide. Hayley returns and the Croppers agree to buy Tracy's baby and wanting to make sure they have parental rights to the baby, Roy marries Tracy. Tracy gives birth to a daughter and she gives custody to the Croppers, who register her birth and name her Patience but Tracy reveals, on Steve McDonald and Karen Phillips' wedding day, that she wants her daughter back and that Steve is Patience's father, not Roy as they never actually slept together. Initially they refuse to give Patience back to her mother but are persuaded by Ken Barlow, Tracy's adoptive father. Roy is devastated and he and Hayley reluctantly return the baby and Tracy renames her Amy. Roy and Tracy's marriage is subsequently annulled and feeling guilty, she repays the money that the Croppers gave her and asks them to be her godparents.

I hope that helps.