Can I be pregnant?

Good morning, if I took birth control pills at the same time, I was not late, nor missed any tablet and also secured myself with a condom that did not break, suction but was not in me is whether I can be pregnant? I would add that I did a pregnancy test yesterday (two days before the expected withdrawal period) I did it in the afternoon came out negative. I would also add that a day ago I got cystitis.