No period

Okay so about 5 months ago I stopped having a period. Back in September I stopped my birth control and I had it twice and just it stopped. I know it’s common when you just stop birth control, but it’s usually 3 months and after that it should be back, I’m coming hot on month 6 and no period. I started taking Medroxyprogesterone it’s supposed to start my period and I took the last pill today and still no period. That’s 10 days and she said it usually takes 3-7 days. Tomorrow makes 11. Keep in mind I have taken several pregnancy test all negative and I have not been with a guy since last June. Should I be worried still? I don’t go back to the Doctor till the 14th.