Why won't my dry mouth go away after drinking a lot of water?

Need more info: You should talk to your doctor. It may simply be the hormone changes of pregnancy but you want to make sure it is not diabetes.

Any meds? : Many medications, including some over-the-counter drugs, produce dry mouth as a side effect. Meds to treat depression and anxiety, antihistamines, decongestants, high blood pressure medications, , muscle relaxants, and parkinson's disease medications are among the major ones. Are you taking any of these meds? Consult with your dentist to rule out other causes.

See dds: Your not getting to the source of the problem, maybe you have sjogrens disease, ( dry mouth).