I don't know who your doctor is, but you should not have been allowed to leave the hospital with an issue like this and no further instruction. Was your OB aware of this issue?? I had the same problem and it was (If I remember the term correctly) a distended bladder. This happened after the birth of my first child. I had an epidural and a catheter with the delivery, and when I stood up to go to my hospital room after the birth, I just peed everywhere. My doctor put the catheter back in and left it overnight so my bladder & I would have a chance to rest - no getting up to use the bathroom for the most part. Before I was to leave the hospital she removed the catheter and checked to see if I was still having a problem. I was, so I went home with a catheter in and my little pee purse. My OB had me monitor/measure all of my liquid input and output for a week. She also sent me to a urologist, to check and see if she could spot anything unusual with me. After about a week, I returned to my OB, she then did a couple of tests to see if I could hold my urine, and since I could, I did not have to have the cath in anymore. I did see the urologist again for follow-up, but I was fine after that period of REST. Let me tell you that doing Kegels is not going to fix your problem. You need to get to a qualified urologist ASAP. Since this is your 3rd child, you may need to do something more than resting as I did. That was baby #1 for me, and I was only in my twenties, so recovery was easier then. After each of my other children, I began to have some leakage issues, and after baby #4, I ended up having surgery to correct stress incontinence. I'm not saying you need surgery, but if you are walking around with this problem, it's probably getting worse. Call a urologist NOW and explain your problem in detail, and that you need to be seen ASAP!! If you're not sure who to contact, and you trust your OB, call that dr and get a referral. Good Luck!!
PS I hadn't read the other responses before I wrote mine, but I just did and almost all of them are only describing stress incontinence - the jumping, dancing, sneezing, etc. This is not what you have going on, and is more serious. Also, what you're describing was most likely not caused by the cath or epi - things shift and push and move during childbirth and pregnancy - unfortunately one of the joys of birth we can't prevent.