Seriously baffled.
Period due to start around Monday. Had some moderate cramps for about twenty minutes, took some ibuprofen. Problem solved.
About two hours later felt a weird sensation and this monstrosity slipped out. No pain.
Measures about 1.5" across and 3/4" wide and high. It looked mucousy to me but DH decide to cut into it (ew) and it's fleshy. It's not possible it is embryonic tissue.
Is it a decidual cast? It doesn't quite look like the ones on Google and there wasn't really any blood.