Ok. I took plan b 2 months ago like said on a previous question of mine. This month my boyfriend and I messed around. I touched a wet spot on his boxers than minutes later touched myself, almost completely positive my hands were dry. My period came on time, but only lasted 4 days and was very very light. it was only heavy in the morning and barely any at night. I also have to pee a lot. and my lower back hurts. I took an AZO and have been drinking lots of water and cranberry juice but im scared. Plz help