I had unprotected sex 11/24 through 11/26 because I knew my period usually comes around the 28th. I got my period on the 29th or 30th, but it was different than normal... I finished my period around the 4th, I believe, but now it is 12/19 & I have it again, but it seems different, like more brown than red & I ve NEVER had my period come 10+ days early. Could I be pregnant??