Late again, day 6

Ok so this is the 3rd post about my period being late lol. 2nd month in row I've been late, this is day 6 of missed period according to glows prediction and my normal ovulation, etc. I don't feel pregnant! And I've been cramping, and to be honest I'm kinda scared to take another PG test since last month when I was late I did and it was negative. I'm not really stressed, I mean not enough to cause my periods to be off they've been spot on since I've started keeping track. What should I do?! Wait a few more days then test? Test now? Geez what's a girl to do lol...advice?