Symptoms disappeared over night..

I have history of missed miscarriages but last week I saw a heartbeat!!! I was 6 weeks. I am now 7 weeks and have another ultrasound in 2 days(I’m high risk so I get a lot of ultrasounds). Anyway, for the last 1.5 weeks I had been experiencing the WORST nausea, vomiting, acid reflux, and fatigue. To the point where they were looking at possibly diagnosing me with HG. It was BAD. 2 days ago my symptoms completely just stopped… and I’m so scared. Anyone experience this before? They didn’t just gradually stop, they stopped over night… and I didn’t take any meds for it either.