If your girl is in her thong and she sits in little bit of your semen and doesnt change underwear what are her chances of being pregnant if she is on the fourth day of her period?

The chances are low, but the probability is not zero. If you wish to gamble, there are a ton of bingo games in just about any town at least a couple of times a week - and this is if there isn't a casino within a short drive. Gamble there, please. The issue is much less life changing regardless of the outcome if you gamble in a bingo parlor. You get away with nothing by flirting with nature and not making good decisions regarding sex and then ending up "not pregnant" after its over. It sets you up for a bad decision. You may become complacent and relax your vigilance, and this opens the door to poor choices. Don't be another "oops" statistic. Too much is at stake. Good luck.