I had unprotected sex with my boyfriend three weeks ago, and finished my period six days before that. I took Plan B about two hours after but haven't had my period yet, and it was due last week. I haven't been cramping which I usually do before my period, but I have had sore breasts and backaches which are symptoms I've never displayed during PMS, and no morning sickness yet. I had spotting about a week after I took the pill for two days, but only for a short amount of time. I'm not on birth control because my mom won't let me take it, and I'm scared I might be pregnant.