Progesterone suppositories..help!

Rachel

Hi girls, so I need some help. My first IUI failed and my RE told me to stop the progesterone suppositories (200mg at night) and wait for AF to come so we could try again. How long does it take for AF to come after stopping? I am ready to get going on this next cycle. I just found out two very young girls I work with are expecting and they both just started TTC in May. It is so frustrating. Thanks so much!