Hate You so Much

Nobody hated Tyler Seguin like Jaime did. It wasn't like he was an awful guy, he just made her life harder and a little more complicated.
Jaime had been an athletic trainer for the Senators when a drunk one-night stand with Tyler turned into a nine-month pregnancy. It became even harder when he decided to be a real father to their son, Liam, even after she decided that being with him was a bad thing. Between carting Liam between two homes, avoid fan hate, working and trying to co-parent with the league's second most notorious party boy, things got messy.
Now, things were working. Jaime was moving to a new job in Tampa Bay, no one hated on her and Tyler and her had made some big steps towards their parenting. Then Jaime finds out she's pregnant again and suddenly everything she thought she had under-control slips through her grasps.

This is one of the sequels to Decision of a Lifetime. I highly recommend reading that first.