Okay so my last period was on October 4th and ended on the 10th. I'm super regular and I know when to expect my periods, but this month is different. I had unprotected sex on the 11th but I don't think you can get pregnant the first day you get off your period. I began spotting on the 17th and it was for a few hours and now, I'm spotting again on the 28th which is around my next period date. I've been spotting for 3 days since Saturday and it's concerning me because it's much much lighter than usual. Could I be pregnant?