question: my last period was on the 25 of feburary. me and my boyfriiend had intercourse unprotected on the 13 of this month, sa couple of days after that i have been urinating like every 20 mintues it seems like i have pee alot but as soon as i sit i pee and only a little bit come comes out. in middle of the night this happens aswell. i also have been having lower back pain and craming in my lower part of my stomach..my period isnt due until the 25 of this week witch is on a friday i usally have period symptons on a wensday. but these cramping, lower back pain and urinating numerous times has beens happening a couple of days after intercourse. what can it be/