Cara> This happens, and it really SUCKS! The fact that it starts earlier and progresses faster in a second pregnancy double-triple SUCKS!!
Try doing your pelvic floor exercises wherever you are. You can do them even lying down, typing messages here or sitting on a dining room chair!
And it's not just you - it's a common problem.
There is a UK volunteer-run website called the Pelvic Partnsership for women with SPD. Has useful information.
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Also, although birth must seem like a long way off, consider post-natal pilates. It will help to tone things up "down here". Might even help with pregnancy number 3.
Main thing is to seek help. Pregnancy should be a time of joy and it's not fair you should be suffering so.