Many bloom fertilizers contain Nitrogen, just in lesser quantities than phosphorus and potash. You don't want higher levels of Nitrogen during flowering, as this would encourage more foliage growth as opposed to flower production. Still though, if it is a nute burn, it could have been caused by elements besides N.

You can still flush your plant, even if you plan on continuing your nutrient regimen. I like to give my plants a good flush at least once a month, regardless of whether they're showing symptoms of toxicity. It's not a bad habit to get into, especially if you regularly fertilize.

And equal shades of You're Welcome, to ya! Good luck with the rest of your grow.