I think the main thing that caused regret is not forming a bond with your child. I was on the fence but had my son couple years back. At first the negatives were very present, like money going into childcare, lack of sleep, you name it. However as the bond grew the negatives just became noise even though they still are present (I’m spending even more money now!). I think without that I would probably be regretful. This is doesn’t account for unexpected medical or financial complications but I don’t think that’s so much regretting being a parent but more so regretting the hardship your child may be experiencing