Faaark!
YANBU!
Just hang in there a bit, this was kinda dropped on you.
It will almost definitely happen. Shit takes time.
I knew I was pregnant with my much wanted baby but the birth was shit and I was out for it (general anaesthetic) and DH out the room because of general anaesthetic, it could have been any baby, then he went to SCBU, then had feeding troubles, jaundice, yada yada.
After a few days and I was caring for him I felt a bit more for him - don't get me wrong, even the day after I had him I went to visit him and I was all full of anxiety that I didn't want something bad to happen to him (don't drop him FFS!) to dh etc, but didn't feel "love" or "connection" yet.
After a few days of me caring for him I found him interesting and kind of cute, but still just a sort of scientific experiment type interest? With a cuteness bonus. Like playing with a puppy.
Then we went home, and it was like oh SHIIIIT. Sat there a bit thinking "i have ruined my life, it will never be the same again".
Few weeks later and I just sort of got on with it, going through the motions then one day I woke up and thought, WHY ISN'T HE AWAKE YET I WANT A CUTE ATTACK!
He's 7 now and when they change the laws I will marry him.
Just hang in there!