I wouldn't say they were creepy together. I have no trouble believing they were attracted to each other from the start - there were lots of little signs before the "I'm falling in love with you" at Christmas. I don't necessarily think she knew she wanted to marry him at that point, is all I'm sayin'. And it wasn't before she was pregnant - it was before she knew she was pregnant - the father was the boyfriend who gave her the info about Danny's not being able to get bonded.
I'm going to start a major re-watch soon as well.