last night after i got off work..i kept feeling the urge to urinate, but i couldnt because there wasnt anything to pee..when i actually had to, after i was done it was really painful. all through the night i kept getting up to pee and it still was hurting. now, there is blood, but this is around the time i start my menstrual cycle so im not sure if its from that, or something else. also i had sexual intercourse on saturday, i heard if you dont go pee afterwards you can get abladder infection..and i didn't pee..
Does this seem like something serious?
have any ideas of what it could be