Yes it is common and usually expected. It's thick, sticky, and may increase as pregnancy progresses. But if you feel itching, burning, an unpleasant odor, or any other symptoms, it could indicate an infection like bacterial vaginosis, yeast infection, or an STD. Any sudden increase in discharge or a watery discharge could also indicate amniotic fluid leakage. Please consult your doctor about changes 

In the third trimester, white discharge is common, but consult a gynecologist if you're anxious. 

White discharge in the third trimester is often normal, but consult a gynecologist for concerns.