While I cannot say anything about the medical site on this issue - I would suggest for your piece of mind to just wait.

You are going through a lot of pre-steps to get everything just right and by the book - if you start the diet while still on antibiotics, you'll never get passed the "what if's". I'd say wait those few days and eliminate having to worry about it.

Just my thoughts - but as stated above, not based on medical or nutritional knowledge.