The pink probably is because you have a yeast infection (which is yeast overgrowth, nothing serious) and are a little irritated with a bit of blood. It mixes with your yeast infection discharge and is pink. Very common. And brown mixed in or a light brown color is just old blood doing the same. Treat the yeast infection. Either see a doctor for this and they prescribe a pill or go the OTC route with Monostat one day ovule. (put in place at night and wear a pad). good luck