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Incorrect readings may be attributed to smoking, drinking alcoholic beverages, medications or eating prior to testing. It is wise to abstain from these things two hours before testing. When you have an oral infection, such as a cold sore or sore throat, you can use cervical mucous instead of saliva for the same test. This should be done to minimize incorrect interpretations.
And interesting:
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Some studies show that an embryo conceived right after the pattern changes from dots to "ferns" is more likely to be a girl, while conception when the "ferns" are thickest increases the chances that it will be a boy.
ETA: hmmm yeah... all the info is saying to test in the morning. I must have dreamed reading that it should be done in the afternoon like an OPK. I'll keep doing it in the arvo tho... it seems to be working (and it stops me from eating for 2 hours of the day ;) ).