TTC after miscarriage

This is going to sound silly but anyone else absolutely TERRIFIED at the idea of getting pregnant after m/c? We found out I was pregnant August 10th. My HCG levels rose and then fell slightly. It turned into a huge nightmare. We were rushed to the ER more than once. They thought it was ectopic at first. I had an ultrasound at almost 5 wks and was told something was there but they didn't know what it was

Turns out it was the baby reabsorbing. We had multiple ultrasounds afterwards which showed blighted ovum. Finally at 9 wks they gave me a pill to force miscarriage. I had my first cycle in October, and we have been BDing. The doctor told us our chances would be pretty good at a successful pregnancy this go around. But I don't understand how she can say that. Maybe I'm just too scared and paranoid. I replay over and over what I could of done wrong. I had two orgasms.. could that of done it? I had a beer before I found out I was pregnant.. could that of done it? I was trying to lose weight.. I mean the list goes on and on. I'm only like 5dpo and I'm already a wreck. I need some positive thoughts ladies.. I feel like I'm drowning.