What is the chance that there has been fertilization, if I take birth control pills, my partner uses condoms, I have performed a lot of pregnancy tests after 3 weeks after the negative intercourse and there was withdrawal bleeding?

Hi, i have been taking birth control pills for a long time. In the last two cycles I have shortened their challenge by 3 days, however, in this I took correctly but i missed the last tablet because of the stress before unwanted pregnancy I wanted to get bleeding as soon as possible. I did a multiplicity of tests after 2 and even 3 weeks in the morning (17, 18,19,20,23 days after the ratio with the least sensitivity) all came out negative, bleeding occurred, it was abundant enough. Is it possible for me to be still in the body despite the bleeding, so many negative tests performed? With such protection (we join with condom tablets, plus I still have polycystic ovaries and uterine crucible) is there an option for fertilization?