Nervous

Looking for a little positive reinforcement! I had a miscarriage in March at 12 weeks but the baby only measured 8 weeks 2 days so it was missed. I'm now 9 weeks and 2 days and I worry that it will happen again. I haven't had a scan yet but will have one next week. As it gets closer I find myself getting more and more nervous that they won't see a heartbeat. I know I have a good chance of a healthy pregnancy, but it's so hard to not let those thoughts creep in. I want this so badly and am afraid of being disappointed again.