my period calendar keep changing

Oladipupo

hello mummies in the house, pls help me explain the cause of my irregular <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">period calendar</a>. for the past 5 months now my menstrual cycle keep changing from 30days, later to 27days now 26days. pls wat can I do.