Well if you have had sex you could have an std...Its very very possible. Secondly with your body being sick and stressed will cause weird things to happen. For reassurance just keep an eye out on yourself, give yourself a few squeezs etc, make sure everything feels ok. If you have any doubts man dont ever hesitate to make an appoitment to the Dr. Best thing you can do is find a good genral Dr. That you trust and can tell anything to.