About a week or 2 before my period starts I get cramps after pee in the morning. The cramps start a minute or 2 after I pee in the morning. But when I get up, if I sit there 10 minutes, then go to pee, it doesn't hurt. Its a deep menstrual cramp type pain that slowly builds and lasts about 20-ish minutes. Its almost like I have to wait for my bladder to wake up in the morning before I can pee. Strange. But the week of my period and the week after I can pee right when I get up with no pain whatsoever. I have had this about 20 years. Any clue what this could be?