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If the drain pan was empty when you started, then accurately puur into a measuring cup to figure how much you removed, then tomorrow go to the dealer and buy more fluid to replace old. As long as you know how much was lost +/- ~2oz's just refill and as long as it was not off from the factory, it will not be off now. If by chance the drain pan was new, you could strain through some cheesecloth or some pantie hose to make sure no dirt that could have fallen off the frame has contaminated it, just reuse it, and purchase 1qt from dealer to add an ounce or two that is still coating the drain pan and whatever you used for a filter.