TMI. Uh... what is this!?

UPDATE: It's retained membranes and they aren't concerned. So gross!UPDATE: I contacted L&D; last night and they didn't seem concerned, but I left a message with my Dr. too. ------------------------------------------------------------It's been 4weeks since my C-section. My husband and I were at dinner and I excused myself the restroom. As I was peeing my abdominal area hurt and I it felt like I was going to pass a large clot or something, but my post-partum bleeding stopped a few days ago. A little girl started pounding on the door, so I just wiped and left. The sensation didn't go away and I told my husband I could feel something in my vagina. When we finally got home I got some gloves and went pee again. This is what I pulled out! What is it!? It smelt so bad 🤢 I started spotting again and whenever I pee I still have the abdominal pain.