Provera question?!

Shay • Married, & We are ttc for our rainbow baby!! Been ttc for 28 months.
Doctor told me if I didn't start last month by may 5th take provera.. well I started so I didn't need it last month. But I started my clomid. Glow says I'm suppose to start tomorrow. Can anybody tell me when I would need to start provera this month if I don't start?