What is this clot?

Okay so I'm 13 months postpartum (BF mommy). I've been having periods(?) since 9 months pp. I just finished my period on 12/12/20. The last time I had sex was 12/7/20 or 12/8/20. I take my birth control (norethindrone) everyday around the same time. Earlier today I had a pretty severe cramp in my c-section scar. When I peed I had this clot (in pic). When I stood up I noticed another clot, about the same size, in the toilet.

What is this clot??