Advice !! Pleasee! TTC

So as of today, I am 6 days late. My period usually only last 5 days, so ive missed my whole period! Ive never done that before. my period if it is ever late, its only by 2 days. I took a pregnancy test yesterday, (first response) which is known to let you know 6 days before your missed period. It said negative. ive been slightly cramping, no spotting. im not stressed. me and my boyfriend have been TTC for 6 months, im really hoping this is the month. Should I wait another week and test again ?