Pregnant or not? Please help

So I have taken my birth control consistently but did miss like one day here and there a while back in January. I had sex mid January 2x both unprotected and took my birth control after having sex both times. I then wanted to make sure I took my birth control enough days after so I could have my period and not get pregnant. I thought I took my birth control for 7 days after, turns out I only took it 6 days after. And also stopped taking my birth control in the middle of the packet not thinking. And usually my period come the day after I stop taking it. But I waited 2 days nothing, then the third day I had very little spotting, and that lasted about 2 days then it stopped so I didn’t have my normal period like I usually do. Then I’ve also been cramping even when I am taking my birth control which I never do when I am taking my birth control, I’ve had back pain, my discharge has changed, I’ve been very tired, getting headaches, and had a little bit of nausea not throwing up and some dizziness. My body just hasn’t been acting normal lately and i have taken 2 pregnancy tests from the store, but think I took them too early. But both of them said negative. Am I pregnant?