Confused by OPK tests
So I have irregular periods and this is the second month I have been tracking with OPKs and body temps. Today is CD 32 and all of my lines have looked almost positive for the last week. Today I got the darkest 2 lines and was certain it was a positive, but then I took a CBD advanced OPK test and it showed nothing, but when I pulled the stick out, it clearly had 2 lines as well. has this happened to anyone else? Which is more accurate?