I may be able to offer advice as Ive been through the delivery.
I gave birth to our twins a little over a year after my partners affair. The pregnancy was difficult emotionally and physically I was a mess. I always thought oh my god what have I done bringing these babies into a family that felt broken I even had thoughts about the silliest little things like OMG hes going to see my jayjay in the light of day. Putting weight on with the pregnancy also played on my mind.
Then came the delivery day. My partner, mum and sister were in the room to support me and my father, step mum and 10 yr old son were in the waiting room. My every whim was attended to. The day was beautiful and any troubles or doubts I had did not once enter my mind. Just absolute bliss and thanks to the midwife and epidural I was on cloud nine throughout the whole birth. I hope that eases your mind. I think that in the end the emotions of the birth outweighs anything else.
Goodluck sweety all the best woosah and massages.