1 doctor weighed in:

Extremely thick white discharge a week before my period was due, it wasn't clear but sticky. Three days later I had brown spotting.

1 doctor weighed in
Dr. H. Hunter Handsfield
Internal Medicine - Infectious Disease

In brief: Infection? STD?

Any new, abnormal, or unexplained vaginal discharge should be professionally examined.
Thick and white suggests infection, which also can cause spotting between periods. At age 21, STDs like gonorrhea, chlamydia, or trichomonas are among the most common causes, so get it checked out ASAP. Your local NHS GUM clinic would be an excellent source for expert, lifestyle-sensitive care. Good luck!

In brief: Infection? STD?

Any new, abnormal, or unexplained vaginal discharge should be professionally examined.
Thick and white suggests infection, which also can cause spotting between periods. At age 21, STDs like gonorrhea, chlamydia, or trichomonas are among the most common causes, so get it checked out ASAP. Your local NHS GUM clinic would be an excellent source for expert, lifestyle-sensitive care. Good luck!
Dr. H. Hunter Handsfield
Dr. H. Hunter Handsfield
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