Blighted Ovum but Delayed Miscarriage

I did an <a href="https://glowing.com/glow-fertility-program">IUI</a> cycle this month and got pregnant (after 2 years TTC). I went in for what I thought was a 6.5 week US, but only saw the yolk sac and gestational sac, which measuring 6w1d. Went in 4 days later and the gestational sac measured 6w5d but still no fetal pole at all. Doctor diagnosed it as a blighted ovum and said I had a miscarriage. Now it’s been 2 weeks and I have had no bleeding at all and minimal cramping. Got an HCG Monday and it was 20,000. Today, Wednesday, came back at 22,000. Going to get a STAT ultrasound to see what’s going on. Has anyone had an experience similar to this? I’m thinking my body hasn’t gotten the memo but I am a little worried.