can you ladies help me

my <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">period tracker</a> said i ovulated the 5th well im now 3 days late on my period, Im tired and having constant headaches. i test yesturday with a digital test and it said negative...should i test again I heard the digital ones are really good unless you have tons of hormones. what should i do?