Frozen embryo timing for transfer

Alejandra • Married to the love of my life, IVF#1 Male infertility. Frozen transfer Sept 15. ❤️🙏🏻 Pregnant Due June 3! Miracle Baby girl is here!
This is my first <a href="https://glowing.com/glow-fertility-program">IVF</a> and I am starting stims on July 10th. Doctor recommends Frozen because we want to do PGS and you can only do it on frozen cycle. How many weeks do I have to wait for a transfer after retreival?  Does anybody know?