Taking provera every cycle

Hi all, I am just now starting my first round of Clomid. My doctor told me every month to start taking provera 10mg for 10 days. So I could possibly end up pregnant but starting the provera before I find out for sure. Dr said that is fine, that it would only help sustain pregnancy. Maybe cause it would be so early in pregnancy?? Cause I see online it says don't take provera when pregnant.