period help

Mariah

I need help with my period dates . my last was Nov 8-12 (5 days as usual) 28 day cycle . I have two other apps that told me I should get my period today but it hasn't came. ive been getting cramping for the last couple days my <a href="https://play.google.com/store/apps/details?id=com.glow.android">glow app</a> tells my I shouldn't get it till the 10th ?? negative pregnancy test btw