Well I had sex around July 21st and got my period in August 14 (It was light then heavy and lasted 6 days). But since, my last period, I've been getting headaches and my boobs were sore non stop. & I'm suppose to have my period in September 11th but in September 7th, my vaginia and boobs were really sore and found blood on my underwear. I thought it was my period but the next day, it got lighter but I still have bad cramps since yesterday. Am I pregnant?