Honestly it could be a subconscious thing because you think you might be pregnant. Most pregnancy symptoms don't start until a couple weeks AFTER you get a positive result. They also are not an accurate way to base pregnancy. If I based pregnancy on symptoms I'd be pregnant every cycle.
I took one and it said Neg and i kind of figure the tracker wouldn't be right but why do i feel this way even now my abodmen is feeling like its on fire and my back killing me and i stay sleepy and hungry but sometimes i don't eat because i have no taste for nothing...
If you have irregular periods than no tracker would be able to tell you when you were ovulating. If you are worried about pregnancy then take a test 2 weeks after the last time you had sex. It should be accurate by then.