I'm a 21 yr. old female, not overweight or anything, I've always been healthy and had normal periods. I've been on the Yasmin pill for about 7 months now but lately I've forgotten to take it a few times here and there. Well I just got off my period 2 weeks ago and this morning I started bleeding and passed a few blood clots. I've also got an aching pain in my lower back and stomach. The bleeding is not extremely heavy, it's about the normal amount I get when I first start my period. I had a pap smear last year and it came out normal (I'm due for another one in March), I was tested for std's and everything came back negative... Could I be having a miscarriage?