struggling big time!

Kelly
I had my first ultrasound this past Monday and I measured 7w2d. We saw the baby and saw the heart an it was 154bpm. We didn't her the heartbeat, but the doctor said things looked good. She said I had a cyst on my ovary, but it nothing too concerning. 
The problem is I am still so worried something will go wrong. I had a missed miscarriage back in August found out at 8 weeks baby stopped growing at 6 weeks. I am taking progesterone this time. I feel like I can't be happy or excited yet, and I'm driving myself crazy. I haven't experienced any morning sickness and not really sore boobs which is adding to my concern.
Can anyone offer me some advice or comfort? I want to enjoy this pregnancy but I haven't been able too.