Progesterone and Clomid

Jessica
My last 2 cycles I have taken Provera for 5 days and then after I started my period I would take Clomid days 5-9. This time my doctor had prescribed me prometrium 200mg to take everyday at bedtime. I don't have cycles without Provera so I'm scared my period won't start since there will be no stopping the meds this time. Anybody have any advice? I'm so nervous!