Anyone else?

I’m 10 weeks pregnant. I went to the emergency room because I had a lot of bleeding this morning when I got there after some test they told me am a threatened miscarriage they couldn’t find the babies heartbeat but did see the baby it’s high in my uterus and it could have been the way the baby was laying. I go to my doctor Wednesday to see if my HCG levels have went up if the have it’s all headed in the right direction if they are lower then..... well I don’t even want to say it. Has anyone else ever experienced this if so what happened? I’m just so scared right now.....