I've been use opks for a bit they have been staying pretty light till last night before bed I checked and it was super dark not positive but like a shade or two lighter then at like 6 this morning when I got up I checked qnd again it was super dark like a shade away from being positive it actual looked positive until I took a picture with flash qnd it showed the difference its now almost noon so almost 6 hours later and the one I just took is very light again I haven't drank much cause I didn't want to dilute it ...do you think I missed the peak or ? I only have 2 opks left should I take one tonight at the same time?