Very big blood clot clear thing???

Amanda
I'm not anywhere near when I should have a period. I have a very abnormal cycle and sometimes no cycle at all due to PCOS. I have had some mild cramping yesterday and then this morning. I went to the bathroom and a bean sized blood clot with a long thing attached came out with some full heavy flow bleeding. The bleeding has since almoat stopped and I only have very mild cramps now. I just wanted to know if anyone else has had this weird thing happen before and what it could be?