5w 5d Ultrasound

Brittni
So last May I had a missed miscarriage that wasn't discovered until the first ob appointment at past 8 weeks. I had a D&C the day after my first appointment at Dr's recommendation. This time my Dr wanted me to come in early. I went on Wednesday for an u/s at 5w5d, and they said I was measuring exactly where my cycle predicted. They took some blood to check hcg levels and called Thursday to say everything looked good, but Dr wanted me to come Friday to check hcg levels in blood again to be sure they're increasing at the right rates. Didn't hear back Friday, so I have to wait until Monday. They want me to come back for u/s at 7w5d and 9w5d. I hoping my Dr is just being cautious for my benefit, but I'm worried there is a reason she is doing so much. Anyone else go through something similar? I'm worried about having another miscarriage