Undeniably Yours (The Kowalskis)

The premise of the story was Kevin a bar owner who gets many phone numbers a night is intrigued by a pretty brunette that walks into his bar one night. After she dismisses him he can't get her out of his head. So when he see's her at his brothers wedding he peruses her. They end up spending the night together and then three weeks later they find out their having a baby.