Yes you can drink cranberry juice. It has many antioxidants in it which are good for you. Depending on how far along you are though you may not want to drink much of it as it makes you go to the restroom quite a bit. The further along you are the more the baby pushes on your bladder making you want to go to the bathroom often anyway. So unless you want to go twice as often I would not drink too much of the cranberry juice.
Yes, as a matter of fact doctors often recommend it to clear up or prevent mild cystitis (bladder infection).
Absolutely, unless of course, you are allergic to sulphites, which is a preservative that they use, spray on cranberries before processing. As well, it is high in vitamins, and will help keep urinary track clean preventing infection
Yes, it is high in vitamins, and helps for preventing an infection.