Pregnancy symptoms come and go?

Allison
I found out I was pregnant really early and I had cramps (light & intermintent) everyday. My boobs hurt pretty bad and last week at 6weeks I started having nausea and vomiting. The last few days (like 3) I haven't been feeling nauseous/vomiting, less tender of breasts, and not really having cramps that much. Has anyone else experienced this with pregnancy where your symptoms come and go? I'm so scared of a missed miscarriage 😟