When to test?? Help

Glow told me to test on CD27, which resulted in a BFN. I was devastated but I wonder of that was too early to test. I ovulated CD15, AF is due on CD29/30. Should I text today or wait? My breasts have been super sore, I had slightly more CM about a week ago and weird things like getting random breakouts (like inside of my ear, inner thigh, breast, etc). I've never had these symptoms before AF either.