Pelvic floor & exercise

Feel very embarrassed, but here goes.... I did my pelvic floor exercises all through my first pregnancy but afterwards leaked, mainly when doing running and/or some other exercises, I thought this was normal and wore big pads, I thought it would improve with time? I'm on second pregnancy (5 years later) and again doing pelvic floor exercises, also reading a bit more about it and realised it's not so normal... I feel like I leak randomly sometimes. I don't like ever need the toilet really desperately or anything and I haven't properly weed myself... Just need some advice really, what can I do to improve this? I want to be able to run and I used to do all the time before my first, had to phase it back a bit in the past few years, and now I don't think I could even run without actually weeing (I don't feel it coming out sometimes?) Help?!