This was weird

I was told by my doctor to have only protein shakes and clear liquids for 12 days pre op. My surgery is on friday. I asked why for example I could not have white fish or tuna as they are high in protein and have NO carbs or fat. Then out of the blue she tells me today I can have it (fish and green veggies) yesterday and today, but back on the pre-op diet 3 days before. Does this seem strange to anyone else that she would change her mind? I did have tuna steak tonight and some jumbo shrimp and last night I had mahi mahi and shrimp...but for some reason felt guilty even though I was told it was okay. She told me pretty much EVERYONE cheats on the pre-op diet, with some eating high carbs etc...!! I ordered a sald tonight but only ate like 1/4 because it had olive oil on it and I knew this would be a no-no!