What does your vaginal discharge look like when your a 1 week before your period comes ?

More info needed: This varies a lot from person to person. At 16, your own pattern of normal vaginal moisture or discharge may still be evolving. But if this is clearly new and different than before, you should see your doctor. There are too many causes to guess, but if you're sexually active, an STD is a possibility. Color (e.g. yellow) or strong odor suggest STD or other infection. If in doubt, check it out!