Can someone tell me what this is?

Went to the bathroom (FMU) to supply some urine for a HPT. Upon looking in my little cup I found this floating. I fished it out with the little dropper from my HPT and put it on some tissue. It was tinged with light pink blood. No, I didn’t go #2. I’m currently 8DPO. Did this come from my bladder or vagina? I have no idea...

Any help is greatly appreciated!