convinced I'm going to miscarry

I'm currently 10.5 weeks pregnant with my rainbow baby. I miscarried at almost 5 weeks with my first pregnancy back in December. I've not had an easy pregnancy so far, with spotting and bleeding that was found to be from a subchorionic hemorrhage. Every time I've gone to the doctor, everything has looked good. Baby has grown, hCG looked good, strong heartbeat a couple of weeks ago. But I am completely convinced that I'm going to lose my baby or that the heartbeat has stopped already. I was having really bad nausea that, while uncomfortable, gave me assurance that maybe everything was ok. But nausea has mostly gone away now, so I'm so very very anxious. I don't have another appointment for two weeks and feel like I'm going to go insane waiting. Has anyone else been through this? Was everything ok? Is my thought that I'm going to lose the baby my mind's way of preparing me for what has already happened or wil happen soon? Needing support...