Aunt Flow

My period is due 2/5 on period tracker and 2/6 on Glow. I had some period like cramps a week ago and severe boob tenderness. I also been getting up in the night with horrible nauseas. And today I'm having really bad pain right on my pelvic area it's killing me. I taken dollar test and the first one I took a week ago seem like something was starting to show up... all the rest after that are negative. Can I be pregnant and not show up yet on the test or my period is coming?