FET Hatched Embryo

I just did a frozen embryo transfer yesterday after a successful pregnancy 2 years ago (5AA) and one failed FET (4AB) 2 months ago. It was our last PGS tested embryo with the lowest grade of 3BB. Before transfer I was told the embryo had completely hatched out during the thaw process. Is that a good sign? Do embryo grades change post thaw? Trying not to get caught up on the numbers and drive myself crazy but praying hard this one takes so I won’t have to do another retrieval cycle. 🙏🏻 any one out there have success with 3BB or lower grades?