I feel like this book has a really good basis it just needs to be worked on a little.
Read the story now
Spelling/Grammar issues can be fixed easily and looked over while reading.
It did go really quick in my eyes and I would love to know more about the characters, give them a little more depth, what do they love doing, who are they as people?
***spoilers to those who want to read it ahead**
I feel like they wouldn't have known she was pregnant that quick and with that many surgeries it would have caused too much stress causing a lot more risk on the pregnancy.
Plus you said in one chapter where he was getting her stuff from her apartment that he then drove to his...they live in the same building so that will probably need altering or it doesn't make sense.
I am by no means trying to be negative and just trying to help you. I really did like your story and hope it can be at its best.