I went in for my first ultrasound today, I'm 5w6d. Except the things is, my uterus is filled with tissue and fluid (as well as my gestational sac with embryo) now my OB said it could be a few things, it could be normal and go away, it could be an early miscarriage, or a molar pregnancy. The embryo has a heart beat of 108. I got my blood drawn to check hcg levels, and have to return next Thursday for another ultrasound. Has this happened to anyone else? I'm really scared, I never had any problems with my son.