Jan. 16 I had unprotected sex with my boyfriend of 2 years. We are usually carefully with pulling out but just in case I took a plan B pill. I was supposed to have my period that week but so far I haven't. I read that the pill delays periods, cramps, nausea, sore breasts, headaches, tiredness, and vomiting. I have some of these symptoms but it's been a week now since I took the pill and I haven't even spotted. Am I pregnant?