While I'm no hardened grower we're currently in the peak season for fungus gnats where I live. I'd agree with SB. By now you should already have a jeweler's loupe to check your trichomes and if there's anything abnormal on your buds then that would be cause for concern. Do some net research on fungus gnats. If there's a lot of pest activity after you water that is a good indicator that's your pest.