
Like any drug that we or our dogs take there are going to be occasional side effects and we must take note and act accordingly.
We must also not get hung up on brand names but be aware of the chemical composition of different products.
It would appear that your bitch is sensitive to Fenbendazole, so would take care with anything that contains this in future.
In your position I would not sue anything else during her pregnancy, but worm the pups and then her once they are weaned.
Do not use Panacur on the pups while she is feeding and cleaning them either, but a suitable alternative like Drontal puppy etc.