Pregnant but ultrasound shows fluid and no sac

Marissa

I went to ER and found out that I was pregnant. Went to Obgyn and did an ultrasound which didn’t show a sac but showed fluid moving in my uterus. I have been having uncomfortable cramps. Doctor said possible miscarriage is going to happen but maybe it’s too early and the sac is starting to form. They took blood to heck HCG levels & I go back Friday to see if they doubled. Anybody else have this happen?