HELP!

Beth
I take Microgynon 30 ED as my form of pill and my period is meant to have started Monday according to the <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">Eve</a> app, but I have 3 white tablets left? 
Is my period late or is the app out of balance!? I downloaded Glow to see if it said something different but Glow says Thursday which is tomorrow??
I have posted in the Period Talk group but want to post in here incase this has happened to anyone else?
I also have a cough and I have read that being ill can sometimes affect your period?
PLEASE HELP