I had unprotected sex 2 weeks ago and took plan b 3 days later. I got my period early but its light. I've been having cramps for the past 2 weeks and my boobs just became sore a day ago and I've been going to bed a lot earlier then I usually do. I got 10 hrs of sleep last night and woke up twice. Had to use the bathroom. I've also been getting headaches. Could I be pregnant?