Hi
Please take a deep breath. Piggies are prone to eating all the things you
really do not want them to but thankfully they only rarely come to harm.
Keep an out for the next 24-30 hours and see a vet as an emergency if your piggy is suddenly looking out of sorts and has lost their appetite.
Odds are however that it won't happen as it's actually not a huge lot Bercy has eaten. We have seen worse with piggies surviving the experience just fine.
You may find this link here helpful and may want to bookmark it:
First Aid: Immediate Care Measures and Non-medication Products