TTC 2 days Late

Sarah

I believe that I had implantation bleeding last Monday the 10th and have taken tests every day since Friday and been negative. I’m currently two days late for my period and still negative but my periods have been irregular since going off birth control and I went two months before I had my last one. Is it still possible to be pregnant but have negative pregnancy tests after a missed period? I have not been able to successfully track my ovulation.