She also could have been the victim of rape and Joseph trying to protect her, instead of her being a cheater and Joseph being dumb. If they both did exist of course.
The thing is, the earliest versions of the gospels didn't contain a nativity story at all, instead starting with Jesus' baptism. The whole "virgin birth" thing was retconned in after the religion was already up and running.
“Yes, (…) [but] the chances of these all happening in real life are virtually zero.”
“(…) one of her eggs would have to produce, on its own, the biochemical changes indicative of fertilization, and then divide abnormally to compensate for the lack of sperm DNA.“