Need help periods

I am so confused, my last period was the 19th January.. 
Glow and <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">Eve</a> both say I was due my period on the 16th-19th. I am not on any contraception and not had sex much only twice on my ovulation days.
Should I wait another few days and see if I come on or should I take a test?