Me and my boyfriend had unprotected sex a lot he stayed the night with me Friday night my mom was away so he snuck over, he cumed in me at least 4 or 5 times for sure. Now 3 days later my boobs are very sore and my stomach hurts, I have had a bad headache all day and my lower back hurts I know this sounds like a period but I usually don't have these symptoms for my period. Could I be pregnant? My period was supposed to come today and it didn't.