I hope things go smoothly, and I hope it's over ASAP. Was it bright red or kind of grey? The reason I ask, I had the same I. Jan and thought the baby/sac had come away, it was hand size so I thought it must be something. It was only a blood clot, I passed two more big ones and then at hospital, the EPU helped me pass the actual pregnancy, which I looked and was pale grey colour.
I had contractions and then the clot would pass, so rest and be aware of any cramps and then going cold and shivery. X
Good luck. I'm thinking about you xx