I had cysitis on and off for the first 16 weeks (more on than off). I have a few underlying kidney problems.

Cranberry juice is good.

PLEANTY of water is better.

Ural is ok and my OB says that it is fine to have when pg. (Drink)

However I would say go and see your doctor. Depending on the cause of the cystits (ie the bacterium) there may be some other concerns. I don't mean to stress you and don't worry as something like 98% of uti's during pregnancy are fine. Just for piece of mind please see the doc.