Can't Stop Worrying- UPDATE

I had two early miscarriages in 2016, and now I'm about 8 pregnant and I just can't stop worrying about losing this one too. I have known about the pregnancy for over 3 weeks now and I keep buying pregnancy tests to make sure the line is still dark. Anyone else going through this? I just have to make it to Thursday for my first ultrasound. Maybe once I see the heartbeat and get some reassurance from my OB I'll feel better. EDD 8-17-17. 🌈👶🏼🙏🏻