I am 22 years old and I had unprotected sex with my boyfriend 2 weeks ago, the next day I went to the pharmacy to buy the Plan B One Step pill. I was feeling fine I didn't experience any side effects. I am usually on tract with my period, I was suppose to get my period 2 days ago May 12 and have not gotten it yet. Since the 12 I have been getting cramps and breaking out like when im going to get my period. I have taken a pregnancy test recently which came out positive and another that was negative. I read the pill can mess with your menstrual cycle but I just want to make sure I may not be pregnant or not. Can it be too soon to tell?