Periods after 10 years on the pill

I came off the pill at the start of June and pretty much immediately had the withdrawal period. A couple of weeks later I then had what I would assume was my first proper period, lasted 5 days.

I’m now 5 days past when I’m predicted to start my period and still nothing. I’ve taken a test which was negative.

I’m assuming I’m just not regular yet but I can’t help but worry that either something is wrong or I am pregnant but the test was wrong 😬

How long did it take for your periods to become regular after the pill?

I have no idea if I even had regular periods before the pill because I didn’t track it (I was 16 when I went on birth control)