It took me a long time to get pregnant in my 30s and I probably have a slim chance of having a second, let alone a third (the number I would love to have). I wish I had started at 23.
I also think career-wise I was just starting out at 23 but it hasn’t been until my 30s that I actually had chance of serious promotions. You obviously never know what could/would have been but I do think I actually would be in the same place in my career.