Could i be pregnant or just have my period?

on june 17th and 18th i had unprotected sex with my boyfriend, but that wasn't the first time. a few days later i started to feel nausea and had bad stomach cramps. i then had a case of diarrhea for a day. last night we had sex again and right after i had a severe cramp that lasted 10 minutes. when we woke up this morning at 4 there was no sign of my period. then upon waking up at 8 this morning i was bleeding. im not sure if these symptoms were because of my upcoming period or what. my period is actually 5 days early. or if these symptoms were a sign of pregnancy. im asking is this because im pregnant and the bleeding will only last a few days or am i really just on my period.? any answers are appreciated