IVF meds

Jennifer
Anyone that did a FET, do you recall when you started the medrol pack of meds?  I am doing a FET on 12/1 and should have started my medrol pack on 12/27.  With a mix up on the mess I don't have them and my doc is saying he's heard of Drs starting medrol on day of transfer. Curious if anyone has really started medrol day of transfer and how it worked out for you.