How long it takes to get a period after stopping birth control pills?

I took birth control pills for 7 months. I finished the package in the middle of my period on july. 1 day was july 18 and I stopped talking it on july 20. And the last day of my period was july23. A month later I got my " period" on August 14 and it lasted for 9 days ( which I think it was a withdrawal bleeding) it's been over a month and i still dont have a period.

How long it takes to get it back