I am a female age 18, recently I have been experiencing sharp pains when on my period. I do get cramps normally, but these are nothing like it. When I sit sometimes, a sharp knife like stabbing pain shoot through my vagina and up into my stomach area. Hurts very bad and sometimes I have to do a few breathes. It also hurt sometimes when I pee and I'm on my period. Again, a sharp pain. When I lay down or just walking around a lot, around the time of my period, I get back lower back pain. No, I am not sexual active. I tend to get constipation as well when I am on my period. Some pelvic pain as well and random times. I'm curious as to what could be wrong.