I've had it happen to me before too. However since I had no health insurance at that time, I couldn't afford to get checked out and have tests run. Other weird pains I've had in that region before are but not limited to pain in my lower abdomen that shoots down into my urethra...kinda hard to explain, and other minor pains that surface after ejaculating. :embarassed:
Although recently I had gone to a urologist (fine-ass woman doctor, hehe) and had her stick her hand up my ******* and shove around up there to feel my prostate...also had the urinalysis tests run and everything came out fine..no pun intended..lol.
If I were you, I'd go get yourself checked out and possibly stop your cycle...I'm no doc, so I'll leave it to them to diagnose...good luck.