16 days late...

My period is 16 days late. I have taken two pregnancy tests since I have been very active... both were negative. I recently stopped my birth control back in April. I went through my normal withdrawal bleeding, and had a “natural” period in May, June, and July.

I know birth control can mess with your cycle a bit so did any one else have this issue after stopping the pill where they had a natural period for a few months then just stopped??