Also have your PT teach you how to straighten out your pelvis and teach you exercises to strengthen the muscles that hold your pelvis aligned. Every woman runs into pelvic obliquity at some point, and there are a kajillion different (fast and easy!) tricks to correct the alignment of your ilia and sacrum. Your PT can try a few with you, and find the one that works best for you.

Most only take about 30-60 seconds, then you use your abs and butt muscles to hold your pelvis in the corrected position. As those pelvic and lumbar stabilizers get stronger they will automatically correct your pelvis before it even starts thinking about slipping around. (which is exactly what they're supposed to do) Then you only need to use your tricks if something really wacky happens that overwhelms the stabilizers. Like, for instance, trying to push a car out of a snowbank all by yourself... hmmmm, who'd do something like that?