I do not believe there is any special code that dictates it is not okay to wear pink on Wednesday. Wear pink today, tomorrow, and the day after. Pink is a great color, generally thought to be female, but men's designer wear has also been dabbling in pink quite often over the last few years.
Pink is a color that is acceptable to wear on almost every single day. Wednesday is no different, you can wear pink on Monday and it would be comparable to wearing it on Wednesday. All colors can be worn if it matches what you are wearing and you enjoy it too.