chemical pregnancy after a mc

Jenna
I had a mc in November and just found out today that I'm pregnant but bc my bloodwork and my hcg being so low it's a chemical pregnancy. Has this ever happened and what was the cause if you know?  I've heard a lot of women say it could be progesterone levels!  Just trying to get as much feedback as I can before seeing the doctor on Monday. I'm hoping they will check my progesterone levels