hi im 16, and i have been with my boyfriend for 5 month and we only recently have started having sex, within a period of 4 days we had unprotected sex 3 times but on the 4th day around noon i took plan b so a week later i we tried to have sex again but iwwas painful, and now im starting to bleed, and i know its not my period because it ended the same week we started having sex, and its only been 2 weeks since its ended what is going on ? im scared .