Help! Off birth control question!!

Nicole
So I've been in BC for 10 years. I stopped taking it in may to start TTC. I didn't get my first period until July. Then I was told I would now start having somewhat regular periods. This month would have been my second period but I'm 6 days late! I thought i was finally pregnant because I had what looked like implantation bleeding 9 DPO and a pinching in my uterus but now even after I'm late with AF all of my tests are BFN
Question is.. Could I still be pregnant or when did your cycle finally become regular after stopping birth control?