Clear blue OPK help

I just tested with the clear blue OPKs with the two lines. I haven't taken a picture but the second line is now about half the strength as the first line. This was also with just under three hours from the last bathroom break. I only have two left and a while box of digitals (circle or smiley). Do I test again tonight, wait until tomorrow, or break into the digitals? I'm on CD 12 of a 26 day cycle.