Worried

It's been 7 weeks since the day my miscarriage started, got a positive at the doctor today, she said theres a good chance it is a new pregnancy. I think so, a week and a half ago i took my own pregnancy test at home and it was vf positive took another once i got back home today and it was much darker and started to show almost immediately. I know im happy but at the same time im worried. What if the tests are still positive from my last pregnancy? Or maybe it's too soon, and i just don't know if i can handle another miscarriage. I want this to be it.... Even though i know ill be scared the whole time i want this to be my baby.