Vaginal discharge is normal and varies during your menstrual cycle.
Before ovulation (the release of the egg), there is a lot of mucous produced, up to 30 times more than after ovulation. It is also more watery and elastic during that phase of your cycle. You may want to wear panty liners during that time.
The things to be worried about include if the discharge has a yellow or green color, is clumpy like cottage cheese, or has a bad odor. If you are worried, see a doctor.