text: It's normal especially if you don't have an orgasm.  The blood flow increases to your erogenous area and makes things feel "swelled up". No orgasm means no "release" of this built up engorgement. Also your vagina is right beneath your urethura (where the urine goes from your bladder to the outside).  The friction "irritates" the urethura and increases blood flow there.  All of this makes you feel increased pressure as if you need to urinate.  You MAY have a bladder infection.  This would increase all of the sensations mentioned above.  But if when you finally are able to urinate you no longer feel the pressure  it's probably not a urinary tract infection.