Strengthening Pelvic Muscles

I have recently noticed that I am experiencing more stress incontinence. I can't seem to hold my pee and whenever I cough, sneeze or lift something I leak 😞 I have always had strong pelvic muscles but since I had my angel baby, it's never been the same. I am so scared of bladder prolapse and the such happening and wondering if anyone else has the same issues and what they've done to help the problem. Thank you in advance!