Confused here.

Well according to Glow that say I am on suppose on my periods on my 2 day but so far nothing happens yet. But I am having cramps and nauseous for passed 2 nights and nothing happens I hv try to pee on my ovulation kits it show negative and even with the pregnancy test it show that i am not pregnant so now I am confuses.So what does it mean is my period late or shall I have it test again in few days time.