God please dont fail me now

I went to the doctor on Friday June 23rd for my first ultrasound which I was 7w2d, during the ultrasound the tech says the baby measures at 6w0d sad but maybe she is right, so then I was scheduled for another ultrasound in a 5 days which will be June 28th. I went for my second ultrasound same thing the measured the baby to be 6w2d heart rate 112ph which is good for the size of the baby but that I should come in, in another week for another ultrasound and if it's the same prepare for a miscarriage...I'm confused because I'm not spotting, hurting, not sick or anything help me lord