Super worried

I'm 6 weeks and 5 days. I don't see my dr til I'm 10 weeks. My boobs were real sore yesterday but today I feel completely fine... like I don't feel pregnant.... with my first I was sick for the first 3 months. I have no nausea, morning sickness and I feel fine. I'm worried I'm miscarriage. Help? Anyone had this problem? My sono is next Monday and I'm nervous....I need to see a heart. Eating.