I'm 4 days late for my period. I started my period in June 2014. It's always been a little iregular. However I'm worried if I've put myself at risk of being pregnant. My boyfriend tends to ajust his penis a lot and I'm always paranoid that he gets pre-ejaculate on his hand while doing so. After he always slides his hands down my jeans to touch my butt and public area. If the hand is dry does that mean no sperm? Also something else is making me worry. I sat on the toilet and the water splashed my vaginal opening. What if the pee that splashed my vagina had left over sperm in from a previous ejaculation from someone else. This happened several times last week. I am very uneducated on this type of info so a detailed and explained answer will be so much appriciated. Thank you so much.