Pregnant possibilities?

Me
According to my <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">Eve</a> app I am 25 days late. Now a week ago I told my partner, and took a pregnancy test which showed up negative... However I still haven't had my period so I am concerned.. And I don't know what to do? Do I take another test?