33 weeks pregnant---dark urine....?

It is really difficult to tell what might be going on but from experience I know that dark urine usually indicates some problem with the kidneys. Either your kidneys aren't filtering wastes properly or you may have an infection there. Have you had any other symptoms, like pain in the lower back area or sharp twinges in your side or tummy (they could be mistaken for braxton-hicks btw)? Since you stated that you are drinking plenty of water, that blood test will hopefully show what is wrong so that you and your doctor can get to the bottom of this situation quickly. I know its kind of scary right now, but hang in there. I am sure that everything will work itself out hon. I had plenty of problems in my pregnancy and my son was born healthy. Try to focus on other things today and keep calm as possible. I wish you luck. Take care.