Should I test again?

JJ
Glow recommended that I test today (3 days before AF) so I did, but I got a BFN 😢 -- then the app said that that could be too early to test ... I wish I wouldn't have tested ... 
Should I test again if my AF doesn't show, or is it a no for sure? 
I feel a little discouraged especially since I have had some symptoms that are not normal pre-period symptoms. 
I took a standard ClearBlue pregnancy test if that makes any difference too ...