Have i passed a gestation sac?

Patient: I passed a sac during what i believed to be a period, after researching online i read about gestation sacs and intended to keep it to take it to GP, the following day i read a bit more and read about people opening them, i decided to open it to see what the greyish thing inside it was. i have attached some pictures and am hoping you can tell me if it could be a fetus in the early stages of development.