Need help asap.!!! The last day of my period was 12/17, I had unprotected sex 12/18(my boyfriend came in me), 12/22, and 12/23 and my ovulation date was 3 days ago(12/25). The past couple of days, I've been experiencing sever headaches and mild nausea.! I don't have anybody to talk to about this so I need to find out if I could be pregnant.!