Good question! I would also like to know that. It doesn't say on the one I bought, but I am just guessing that as it promotes malabsorption of certain vitamins it would be a bad idea to take when pregnant? Just guessing here, though.
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No, you can continue using it after ovulation. At BFP, you can either stop or if you need something for regularity, I'd switch to one of the other fibers like Metamucil or inulin and be sure that you are taking yoru prenatal and a DHA supp at a different time of day. That way the vitamins will be absorbed at a different time of day than when you're using the fiber.
The little ball of cells that will become your baby does not need anything from you that first little bit, so it is fine to continue the fiber until BFP and then drop it.