PERIODDD

dls
how do I log that I haven't started my period on the date it says I'm supposed to?I also have the <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">eve</a> app and it says I don't start until tomorrow??? I'm so confused? I'm on birth control so I basically know when I'm supposed to start, I usually start the Tuesday or Wednesday of placebo, and I'm on Monday.. but the apps are confusing me? how do I fix this