Symptoms come and go

Hello everyone I'm currently 7 weeks and 4 days today. My symptoms are no where to be found today, and with having bad anxiety it's made me so worried and can only think something is wrong.. I went from being nauseas all day everday, and sore boobs. To not feeling anything today at all. I guess I'm also really worried is because I had a miscarriage back in October when I was 7 weeks and 5 days. Is this normal?? I've already called my doctor to see. And also had an ultrasound last week with babies heartbeat.