How much will 4 points into your Flex Points cost you? Not a whole lot.
How much will stressing over 4 points, thinking you blew it, and giving up for the week cost you? Way more than eating that rice krispie treat!
Like you said, you may be in for a gain initially coming off low-carb. Don't sweat it. Give the plan an honest, fair chance to work - more than a week or two. Stay off the scales in the interim! You aren't doing yourself any favors by checking up on your weight day to day right now.
Think of this as a learning experience. What did you learn? To look up the points of a food *before* it makes its way into your mouth! Knowledge is power!