Need some emotional support.

As of today I'm 6 weeks along. I don't have many symptoms. My breast don't hurt although I have sore nipples. I'm tired majority of the time. I don't have any morning sickness. I really don't feel pregnant. I'm concerned of a miscarriage. I miscarried before. I had a dream I went to my ultrasound appoinment and they couldn't find a baby in the sac. So I search the web about miscarriages and came across blighted ovum and reading about this scared me. My first appointment is a JULY 27th. And I'm sitting here crying and freaking out. Should I be concerned? I just need someone to reassure me I'm ok. And baby will be fine. Thank you.