Re: spotting..something to worry about
Most likely it is the birth control pill that is causing all of this. When I was on the pill continuously for about 20 years, I began to have the exact same problem that you are having (pelvic pain and spotting which after a few months turned into heavy irregular bleeding). I went to my doctor and did an endometrial biopsy, just to be sure that there was nothing wrong with my uterus, in addition to a pap smear. When these came back normal, he was going to switch me to a stronger pill but I said no way and went off the pill altogether (I used another form of contraception). This immediately solved the problem and I have never had any spotting since.
I hope this helps.