Getting a man while pregnant or already have a kid.

Why does it seem that just because a woman is pregnant no man is willing to be with them? Or even if they have already had their child. Sometimes women get lucky but are we just suppossed to hope and pray that we are one of the lucky ones.

Im 16, so i dont know too much, but i'd think that a man doesnt want to do that is because the woman is tainted and some other man has had his penis in them. Alot of women arent virgins, but pregnanancy is physically visible.