I'm FOUR days late for a very IMPORTANT DATE😱😬

Jordan
Yes you read it right I am now FOUR DAYS LATE for my period!!!!
BUT heres the dilemma this is the NEW PERIOD START DATE THAT <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">EVE</a> MADE FOR ME. So should I just wait until my normal period days or should I go buy a pregnancy test??? 
Before you ask YES I have been having sex crazily with my bf since I got home from college (May 2nd) and sometimes it was protected and several other times it was unprotected...I'm not scared just confused and eager for ANSWERS!