I was prescribed 10mg sub. of provera (medroxyprogesterone) to regulate my period after missing 2months in a row. it has been 4-5days and period has not come yet. do i wait?

Depends: If you have no risk of pregnancy (no unprotected sex), then it is good to continue the progesterone to induce a period. If there is a chance of pregnancy, do a home pregnancy test. See your doctor if no period comes especially after 10days of oral progesterone.

Wait 7 days: these pills are not magical and you did not state if taking once or twice daily. Wait one week, then call your prescribing doctor.