Period Help Please!!

So i didn't get my period for about 3-4 months. Went to the doctor talked to her explained i had taken plan B and then my period had just stopped. She prescribed provera (1 bottle) and said it would try to get it back on track so i took it worked for the month of july's period. But it is now august and i haven't gotten my period. So i think i'm gonna need another provera prescription. 😕 Has this happened to anyone?! If so how did you get your period back on track?!

P.s: my periods were always regular

Also i've taken pregnancy test _not pregnant_

UPDATE: I already started my period.