Anyone seen this before?

Tray

This came out when I went pee. Anyone seen this before? No pain, burning, or itching. I’ve been on pelvic rest for 16 weeks. Have a message in with my Dr, but wanted to seek others opinions too. I’m 18.5 weeks. My water broke at 19 weeks 2 years ago and I’m terrified! I have possible placenta Accreta. Any advice would be greatly appreciated!