I also have a pee problem when i do jumping jacks, but i've never had children before. what does this mean?

Bladder instability: Well, our bladder holds urine with the help of pelvic floor muscles, bladder muscles and a small gate ( sphincter). For us to urinate, there has to be perfect co-ordination of opening of the gate with relaxation of pelvic floor muscles while contraction of bladder muscles. So you don't have to pregnant for this synchronicity to be lost. You need to see urologist for further work up.