I would suggest seeing your plastic surgeon for further evaluation. How much bleeding are you having and where is it coming from? Sometimes patients may have some drainage from drain sites from residual fluid or seroma and no treatment is required. Other causes could be a small blood clot which is liquefying. Sometimes a suture may become irritated and cause a small amount of drainage. Your surgeon will be able to evaluate the source of this problem after examining you.
If your bleeding is excessive, active with bright red blood, you should seek immediate attention. I would doubt this to be the case.