Pelvic floor exercises

Since I got pregnant I always heard how important is to do pelvic floor exercises ,but I never did. After giving birth midwifes kept reminding again how important it is ,so I did sometimes when I remembered. So after about month after giving birth I was laughing on the steer and noticed I just started to urinate without even feeling it. Then I started to do pelvic Flor exercises and noticed difference until today when I decided to do do workout ,as soon as I jump I feel pressure down there and again urine comes out . Is it too late to do pelvic exercises ,can I still change something?