Question about first response opk's?

Elizabeth • TTC baby # 1 with my wonderful man. :)
Today is my peak day according to glow. I've been using my opks for almost a week now but I'm still getting just a faint line? I know that the last two monthes my clear blue easy opk showed smiley faces on day 14 and then again about a week later. Not sure what's up I have a 32 day cycle most of the time. Today is day 19 for me any advice?