Need prayers and positive thoughts

I had a scan at 6 weeks 2 days both sacs. Another ultrasound at 7 weeks 2 days a baby this time but she said the baby was measuring small for where it should be. Thinks it could be a possible miscarriage. Took blood that day said it was 66,000 and on the low end. Which I don’t understand and never did a repeat to see if it went up or down for miscarriage. I have my last ultrasound today at 12:45 and I’ve been praying that we get a miracle and our baby has a heartbeat today. We have wanted this baby for 4 years. We need all the positive thoughts and prayers that today we get better news! They already scheduled for my D&C for Wednesday with my RE. I just don’t want to make a mistake if there is a possibility the dates are wrong for our baby or he/she is slow growing. Also what questions should I ask to make sure we’re making the right decision?