I'm 4 days late I tested twice and both bfn!! I'm usually right on time. The second day of my missed period I had to click "my period is late" on my <a href="https://play.google.com/store/apps/details?id=com.glow.android">glow app</a>, I did it again the next two day I missed. Glow just keeps uping my period to "you should start your period on X amount of days" what does this mean??