Pregnancy and producing too much urine?

I am 33 weeks pregnant, and was in the hospital yesterday for blurry vision and dizziness. Obviously concerned with high blood pressure they did a NST and monitered me for 3 hours. My blood pressure was a little high when i got there, but fine by the third hour so they sent me home, but with a 24 hour urine test. I am concerned at the actual amount of urine i am producing. I have filled the 3 L jug they gave me and almost filled a whole 64 oz (totaling just under 5 L) juice container, and I still have 3 hours left to go. I do drink alot of water, and I knew I was peeing often, but I just thought it was being pregnant having a smaller bladder, up until I saw the actual volume. Is this much normal, or too much?