Aphrodite, first of all, I am not sure if the bladder pain that you are describing is an infection. If what you're describing as cramping is on the side of your abdomen, it is more likely to be the stretching of the ligaments. But if it is more like menstrual cramps, or if you have lower back pain, or if you notice any blood or pinkish mucous in your vaginal discharge, you should definitely alert your doctor, because those are the signs of preterm labor. Just being achy is not. Pick up the phone and call your doctor.
Chances are it's nothing, but it is always better to be on the safe side.
And please call you doctor if you have any symptoms of an infection. Treating infections promptly is one of the best ways to head off pregnancy problems such as preterm labor. I delivered the first vaginally and the second by c-section. Amy, well all things being relatively equal, which they won't necessarily be, second and third labors are more likely to be somewhat shorter than first ones, because your body is more practiced and your muscles are laxer. But because I don't know what the reason was for the c-section this one is definitely hard to predict.