What to do if no period after depo-provera shot? it's been 7 months now!?

Common with Depo: It is not unusual for women on Depo-Provera to have very light or even absent periods. That said, I am assuming that you have been getting the shots every 90 days and are still under the influence of the medication. If not, then you are at risk of pregnancy and should do test. Also, if it has been 7 months since your last shot, then I advise seeing your Gyne to check hormone status & thyroid.