I've answered this question before, on another chat forum, & it was hard to type it out.
I have one child, a son, now 18. I assumed I would have have had 2 or 3 (twins with the second pregnancy) by the time I was 30. It took me ages to conceive, & he was born when I was nearly 33. My marriage is pretty crap.
If I had an absolute choice, I would choose to have had no children at all, & to not have married my husband.
Much as I love my son, he is not the reason I exist & is now becoming an independent adult. I'm glad I had him, but if, looking back, if I had the chance to change the number of children I would have, I would change it to zero, rather than to two or three.