H.H.
its called pelvic floor disorder.
there are restorative exercises for it (yes better than kegles) , though many resort to surgery.
From my research I understand that pregnancy exasperates this issue but does not cause it. It boils down to poor alignment. Your core and pelvic floor were not strong enough to support the pregnancy. So in addition to restorative exercises, you are going to have to seriously look at your alignment (closely related to, but not the same as posture). Its a rabbit hole. trust me. Here are a few teasers to get you started.
Alignment-Matters-First-Five-Years/dp/0989653900