I'm not suppose to start my period until this coming up Saturday. But last night & this morning, I've been cramping pretty bad & spotting but not enough to even get on a pad or panties. I had unprotected sex twice when I was ovulating. I asked my friends about it and one said she went through the same right before she got pregnant. & my other friend said that it could just be my period coming early. Does any one else have  thoughts?