Degenerating Embryos

I wanted to reach out and see if anyone has experienced this. We converted godanotropin cycle to <a href="">IVF</a> and had 18 embryos on day 1 and only ended up with 3 (5 day embryos). RE said my embryos degenerated. I am 31 years old w/ hx of PCOS and my RE said this is extremely rare in someone this young and they don’t know what could cause this. They said it could be something biological with my reproductive system. Has anyone had a similar problem?