pregnant after miscarriage

Virginia

A year ago I had a miscarriage and didn't even know I was pregnant! I was 8 weeks along when it happened, and it was a chromosome mix gone bad. I got a shot from my obgyn doctor that took care of that problem (rh positive or something like that). This time we were trying to get pregnant, and I'm only 4 weeks 4 days. Because of my previous miscarriage I am actually pretty terrified! It's defienently different this time. Not smoking, being healthy, more prominent symptoms, ect. but is it normal for me to be scared? I'm looking for words of comfort and encouragement. Thank you!