Infection in Belly Button After Smartlipo? Drainage?

I am not sure if I am dealing with an infection or just normal drainage/swelling, but I am 4 days post-op after having Smartlipo done to my lower abdomen and flanks, and when switching compression garments I noticed my belly button is red, swollen, and irritated with clear fluid inside. Could this just be normal drainage? I won't see my doctor until next Monday, so not sure if this is something common that will subside, or if I should contact him sooner?