Help!!!

So I have the period app and the glow app and I constantly track my period on both apps, the period app says I should have started today but the glow app says I still have 2 days left until I should start. I took 3 tests the last 3 days and all negative. On the period app it says my OD was on the 17th but glow says the 18th. I only BD on the 17th but not the 18th due to different schedules. I have also had sore nipples and sometimes felt nauseous when I smell things I don’t like. So my question is am I out this month or should I test again in a couple days.