10 w 5 days

I had an ultrasound at 6 w and saw my baby's heartbeat, and haven't had any ultrasounds since. At 8 weeks the only symptom I had went away. Aside from heartburn and occasional nausea, anyone else ever worry about a missed miscarriage at this point? Someone once told me if all your symptoms go away at a certain point it's possible you've lost the baby? I suffer from anxiety so I'm trying so hard to be positive until my appointment on Wednesday in hopes I get to hear my baby bean.