I'm really confused, my periods have been weird lately, I've been getting them every 3 weeks but before that it was every 4 weeks, I think it's down to stress, my period is the same every time tho, no different!! Recently I had unprotected sex, and 2 days after I started bleeding, and it works out to 3 weeks when I finished my last period, but my period isn't normal, it's a lot lighter than normal, and when I wipe its red and dark and sometimes when I wipe its brown and I'm not getting the usual cramps but did get tender boobs the week before like I normally do, is this a period? Or am I pregnant? Please help!!!!