
I only ever use the liquid 10% suspension, much cheaper per dose than granules.
I bulk buy and the dosage for sheep is 1 tenth that per kg of bodyweight so it must be pretty powerful stuff.
If she has passed a worm then it is doing what it is supposed to and I certainly would not up the dosage in pregnancy. If you feel you need to wait until a few days after whelping.
I have used Panacur all their lives and have never seen a worm. The only time I have seen adult worms when using Panacur was with a 6 week old rescue litter of GSD who were obviously full of worms (pot bellied, anaemic etc).
In the above case the pups were being given the half dose every day for three days, after the first day they were evacuating the dead worms from every orifice and the vet told my friend not to give them the third dose as they simply couldn't handle it so poorly were they with the huge worm burden.
They were fed up and made better before being wormed again two weeks later with o adult worms seen.