Devastated

I got the worst news of my life today confirmed with second beta that hcg level is below 1. I don’t know what and where went wrong , I had a perfect day 5 PGT tested 2AA embryo from my recent ER which was transferred on 12/30. Beta on day 10 post transfer my hcg level was 3 and today they confirmed less than 1. I don’t understand what could have gone wrong, I am 36yo and my husband is 38. It was a 2AA euploid. We did accupuncture too as suggested by my doc. Everything per her was good. Perfect uterine lining of 7.8, progesterone levels were 25, great estrogen levels. Nothing was wrong by book. It was fully medicated cycle, including birth control, lupron, estrogen patches, pio, progesterone peasary with Aspirin and vaginal estrogen too.

Has any one had a similar experience?

Is there something we could have done differently?

We are planning to do next round of FET, want to make sure what we can do differently for guaranteed success.

Please share if anyone knows what the next steps would be from here on. My consult is two weeks away and feels like I will be wasting time until the consult.