Early miscarriage or cyst?

I have pcos and been ttc for years. My periods are usually irregular and heavy. However, lately my cycles have been consistent about every 5-6 weeks. My bleeding started a few days ago. So if I am pregnant, I would be about 5 weeks. I tested at 4 weeks (negative) but haven't tested since then. I hope to get to the store tomorrow to test. But today I passed some strange tissue (or miscarriage?) I've had clots before but this looked like a long little fatty tissue attached to a tough raisin-like tissue. I will post some pics. What do you think it is? I will call my obgyn Monday. Pics are in the comments.