Aww op, aside from the part where DH wants a second, I could have written your post.
I had a horrific pregnancy, from start to finish. Like you I had pre-eclampsia (mine was not mild), and ended up having to deliver via EMCS at 34 weeks. DS was then in NICU for nearly a month. The pre-eclampsia wasn't even the worst bit; I had horrible sickness as well as heart burn throughout, had to have a cervical stitch which then became infected and prolapsed, had 2 or even 3 high vaginal infections, and came out of pregnancy 7kg lighter than I went in. It was horrific.
I was always one and done, but like you, have felt some guilt over not giving DS a sibling. Particularly through lockdown, I feel like a sibling would have been nice for him.
However, weighing the risks to benefits, it's just not worth it. These are my thoughts:
I could end up leaving DS without a sibling AND without a mother.
I could do irreparable damage to my physical or mental health.
So many children are only children and very happy.
We make an extra effort with DS to make sure he has lots of friends and social activities- especially with other only children.
If I had another now, they would be so far apart in age, they wouldn't have much in common anyway.
I had a sibling close in age and we were never close, even as adults.
I know many many people with siblings who are not close.
Being 37 now (almost 38), this would be a higher risk pregnancy anyway
I just don't want another baby. I have always known I was one and done.
I love other little babies but have never felt broody for one.
It's okay to just have one child.