Short or long ivf protocol

Hello ,

Did anyone experience a dummy embryo transfer to check the cervix before starting <a href="https://glowing.com/glow-fertility-program">ivf</a> procedure ?

Also with pcos, is the longer protocol or shorter one recommended ? My dr recommended longer protocol to avoid OHSS but I read online that a shorter protocol reduces risks of OHSS due to short medication timeline . Could you all please share your experiences ? Thanks in advance !