I just started my period 3 days ago on time and it has been bright red. It usually is not this color. It isn't heavy and seems to be normal, its just the color that worries me. I had surgery on my foot in the past week. I am on birth control and it is not possible that I'm pregnant because I have had many blood tests and such done because of the surgery. Maybe having surgery has something to do with it? Any information would be appreciated