When I should test

I’m 6 days late my period is almost completely missed usually by days…day 7-8 my period is gone!! Should I test when my period is completely missed? Cuz I’m nervous for inaccurate reading!!! And I’ve been cramping like period cramps so I assume I’m about to start bleeding and when I wipe nothing! But I’ve been super bloated and wanting to eat everything!!!! Now I tested and I saw a VVVVF line to the point it wouldn’t pick up on camera!!!!! and I was cramping still so I assumed mmm maybe I’ll just test after I completed miss my cycle