Hiya I suggest phoning your emergency vet for advice, he / she may be able to give your bunny something to protect the stomach .
Your bunny may appear well, but could become very poorly quite suddenly, so best to act now rather than wait .
So sorry not to be able to give more positive news, but your vet should be able to help/ reassure you.
Good luck and please let us know what happens.
Thinking of you
Adele