What Lenny said!

Go to your Dr & get a referral to an osteopath.

My SPD is fairly low key now (a massive fall on my butt thanks to my horse knocking me down re-aligned everything... not recommended - but it worked!), but I find it does feel worse after BodyVive class, or any exercise that has you doing one-sided, leg spreading exercises. There are many parts in Yoga (BodyBalance) that I have to modify so I'm not encouraging further separation. But having said that - I do that class around 4 times a week now, & my pelvis feels stronger for it. However, I think my sacrum has opened a bit which I am attributing to the yoga.

If you do maintain classes, don't try to push yourself to your pre-pg abilities. And if you do moves that require leg separation, don't go as wide as any one else in the class. I can usually feel my pubic symphysis pull & open when I go too far.

Oh - And ALWAYS let the instructor know that you are pg & you have an unstable pelvis!