My boyfriend and i were being sexual, intercourse did not happen, but his penis did touch my vagina. Just to be safe, because i wasn't on my birth control, we bought a Plan B which i took the same day. The later month my period came, it started off like a regular period, heavy a little bit of clotting but after three days it slowed down. Than i stared spotting the Sunday after my period started, i started taking birth control again and the next day there was spotting. What could be the issue?