OPK question

lisa

This is my first month using OPK,( I have 30-31 days cycle), they have all been Negative so far. Some days I don’t even see the test line at all. So Glow says I should be in my peak soon. I don’t have ewcm nothing, will the test line shows or gets darker really quick in the next 2-3days ? Only because now I can’t even see a test line.

BTW, anyone has the same cycle date ??