vaginapagina | I need help identifying something.

I was put on Loestrin 24 by my gyno for PCOS. I never cramp when I'm on my period (when I'm not on the pill). Today was the first day I started my period on the pill and I was cramping like I've never cramped before. I couldn't move and the pain as unbearable. It felt like diarrhea and cramps at the same time only when I would try to use to bathroom nothing would come out. After pushing so much, something came out of my vagina. It looked like a clot at first, but it was huge. I fished it out of the toilet with an instrument and put it into the bathtub. I washed the blood off of it to see what it was but everything I've researched comes up empty. Could you please help me identify it? I put my finger next to it to show its size. The picture was taken while it was still under water.