What causes women to get thick creamy white discharge 1 week before period is due?

Discharge is normal: It's normal for a woman to have discharge every day. Discharge typically changes in consistency through cycle based on changes in hormones. So long as discharge doesn't itch or smell fishy, it's okay. Sometimes when women have copious amount of discharge it can be a sign of a bacterial infection. If you're worried, see doc for check up!