I put a blood clot in water, there is 2 inches of tissue left, I took a pregnancy test, it was negative. Is it my uterus lining and if so should I be worried something is wrong with me like cancer or tumor, etc...? I have polycystic ovarian syndrome, if that helps. If it is a miscarriage is it possible because of my syndrome the pregnancy hormone could be too low to show up? I hope its not but I hope its nothing to worry about either. Thanks.