Help!!!

So Bu boyfriend and I have been trying to get pregnant for a few months now and I have 2 different <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">period apps</a> one says I’m 4 days late and the other says I’m supposed to get my period today 5/28. When could I take a test? I e attached a few moths from my last few periods. Can anyone help me