Has anyone gone through this and been ok?

So I went to the ER tonight, because of slight bleeding.. For the 2nd time in a week. The doctor told me that my pregnancy levels are really low for what they should be.

I have to call my doctors tomorrow. And they are going to have to do another test to see of the levels go up. The doctor said it will either be a slightly difficult pregnancy or a threatened miscarriage.

Has anyone been through this and came out ok? With a healthy baby? Please I am so scared and trying to stay positive.