Physio is probably where you are headed. Go to the docs and don't be embarrassed. How poor is your bladder control, are you constantly leaking? Or is it stress incontinence. They can test how strong your pelvic floor muscles are by placing a probe in your vagina and getting you to clench, the machine then records how strong your grips are. Fron then they might give you weights to help you perform the properly, or a machine that gets the muscles to do it for you. Like those abdominal muscle toners really.
My friend is a physiotherapist and she specialises in postnatal incontinence but she has told me stories of little old ladies who have practically know control at all and have become continent again, so there is hope for you.
A bugbear of mine is that after you have a baby they give you a leaflet about pelvic floor exercises and that is it. In France women get sent to clinics to make sure everything is ticking alright down below.
Good luck.