I'm sitting on the bags... I go through them 100 times... and such a q…

I'm sitting on the bags... I go through them 100 times... and such a question, do you need disposable underwear for childbirth or only postpartum? And still... if the water drains away, how did you get to the maternity ward in those same panties and with contractions? What was it like in the delivery room all the time?) The question may be funny, but damn!