Follow up ultrasound :(

Amanda
I had a natural mc at 11w4d on May 29th. Nothing was normal about the pregnancy. The baby never grew like it should, I spotted a bunch, the heart rate was slow. 😢 
Today I had a follow up ultrasound because I had nearly 25 days straight of heavy bleeding at the time I should have gotten a period. The tech says "wow you would have already been 19 weeks!" Thanks for pointing that out...😑. Then said there's still free fluid and part of my uterus looks thickened. Now I have to just wait for the dr to call with her interpretation and its torture!! Anyone have anything similar and know why there was thickening?