Dilating cervix before transfer?

A

Hi ladies, so my RE wants to sedate me next week to dilate my cervix so the transfer will go smoothly. Only thing is I haven't even started my injections. Can this procedure be done while I'm having my ER or does he have a reason as to why he wants to do it ahead of time? I was just coming out of a procedure when I scheduled this one so maybe I didn't get all the details? I will call and ask tmrw but did any of you have this surgery?