Any advice dealing with anxiety?

I had a miscarriage in March of this year. It literally broke me and I never thought I would come out of the darkness that I spent months in. Somehow I made it past all the pain and hurt and found myself again. I am now 7weeks 3days pregnant with my rainbow baby but the fear of losing this child is overwhelming. I had an ultrasound at 6 weeks and saw the tiny little heartbeat but now I just feel like something is wrong. I'm not sure if this is in my head or I should get looked at but I'm so scared. I know it's normal and okay to have these fears and worried but it's taking over. Does anyone have any advice they could share sometime that might help them. I'm so lost and feel so alone. Someone please help me!