Why would i have a pink discharge after a yeast infection?

Probably not yeast: Yeast infections typically do not cause colored discharge. Pink suggests possible bleeding, which could happen with severe yeast (with vulvar fissures, sores, etc) -- but not "after" a yeast infection is gone. You might have something else, such as an STD if at risk. In any case, recheck with your doctor soon and follow her advice.