Do you also believe she had a painless childbirth?
I have never given it much thought, and since Scripture is silent and there is no Church doctrine on it I am free to believe or disbelieve as my reason and faith lead me. However, reasonable person, viewing miraculous events that happened 2,000 years ago, would certainly weigh the witness of those much closer in time and in degrees of separation. And if I can believe that there was a virgin birth I have no reason to doubt the possibility or dismiss it outright out of a disdain for those who believe it.
Peace be with you