Any idea or thoughts of when on earth my next period may start?!

Last one was on 9th Feb and lasted only 4 days - very on and off and didn’t get really really full on. These are my cycles in order of the last few months ..

26 days

23 days

30 days

20 days

My <a href="https://play.google.com/store/apps/details?id=com.glow.android">glow app</a> is going by my last cycle of 20 days meaning I’m 2 days late now but my other app is using averages and says I’m not due for 8 days !!