How common is a missed miscarriage

Crystal

So I had a sonogram of baby at 10 weeks 4 days this past Thursday and baby is very active moving around waving and punching heart beat was 171. But on Saturday I was having mild cramping and a little bit of spotting but it stopped. But I guess my question is how often does a missed miscarriage happen with such an active baby. I’m extremely nervous it may happen to me. This is my first baby done with <a href="https://glowing.com/glow-fertility-program">IVF</a> and I have very bad anxiety.