Symptoms disappear at 8 weeks?

Hi, I'm really nervous that all of a sudden my nausea and sore boobs disappeared about two days ago. You would think I'm relieved to not feel nauseated anymore but I'm worried it's a missed miscarriage. I'm 8 weeks today, started nausea right at 6 weeks and it was worse during the 7th. Boobs have been sore off and on since week two. I'm just hoping that maybe I'm lucky to no longer be sick but I have also been reading about something called missed miscarriage or silent miscarriage. I don't have another appointment for another two weeks. Had my first appointment at 6weeks and we did hear the heartbeat. I'm not sure how worried to be.