I get pain there and in the front of my pelvic bones also (PSD). I recently read Cecile Rost's "Relieving pelvic pain during and after pregnancy" and it had some exercises that may be helpful, I need to try to do the "starter" exercise more often - it hurts, but she says after you do it a bit it won't hurt any more. She also says that the advice to keep your legs together actually makes it worse and has lots of tips on how to do regular activities in a way that doesn't hurt your body.
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You're probably doing one of the best things you can do, seeing a chiro. I hear PTs can also be helpful. I started seeing a chiro half way through my last pregnancy for this kind of thing and I'd say my pain got a little worse before having DS, but not at the same rate as it had been before getting treatment. This time, I've been going to the chiro since before I was pregnant and it's not nearly as bad as last time, pretty painful sometimes still though especially when I overdo it.
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I also like Julie Tupler's "Maternal Fitness" for great pregnancy exercises that can help support the pelvic and ab muscles.
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I have a support belt I got from Motherhood Maternity - a very simple elastic belt. I use it sometimes when I know I'll be walking or standing a lot, but I don't want to use it too much because I think it is good for those muscles to get used not just supported and dependent on a belt - KWIM?