What date did you stop the pill?
How old are you? Thank you.
When women stop the pill, they usually have a withdrawal bleed, and then tend to not have a period for 5-6 weeks. I think that's what has happened to you. You can't really expect to have a period 4 weeks after stopping the pill. It's why we usually recommend not trying until you get your first period completely off the pill. By that time your usual cycle will have resumed.
If you don't get a period in another week, I'd do another pregnancy test. But it wouldn't be too unusual if you don't get your period for another week or more. Best wishes.