hi i have always had irregular periods but the last few months they have been become regular..i am allergic to the contraceptive pill so i use no birth control im 20 and have an active sex life with my bf he is 25 ..last month i noticed after sex when i urinate and wipe with tissue there would be very very light blood on the tissue we do have rough sex sometimes..i got my period on the 24th of september till around the 29th..then i was on holidays and i got up that morning and went into the toilet and i had my period again this time it was so heavy i could not get off the toilet i could not stop bleeding..that period only lasted about 2-3 days..today i have period like cramps and every time i stand up i get stabbing pains on the side of my stomach..should i go to the hospital?