From what I understand, cranberry juice does not cure a bladder infection. You will need to see a Dr. and get antibiotics for that. However, 100% cranberry juice* will help prevent the infection from getting worse, so continue to drink it along with plenty of water.
*Make sure it is 100% cranberry juice and not a cranberry juice "cocktail" that is mixed with other juices such as cranapple or crangrape. Those won't help.