I am 15 years old and I have been taking birth control contraceptives for about 4 months now, and yes i will admit that i missed a few but recently I've been having very irregular periods. It's been a over a month now and i have continued to bleed (sometimes spotting, sometimes heavy). The bleeding stopped for about 2-3 days and started right back up again. On top of that i have cramps that feel like my lower abdomen is stuck in a knot. These cramps are triggered when i get aggravated i noticed and sometimes they just happen out of no where. I would really like some help. i went to the doctor but they just prescribed me a different birth control pill and gave me a pregnancy test, which came back negative.