SPD stands for Symphysis Pubis Dysfunction. The Symphysis Pubis is the bone at the front of the pubic area which has a gap that increases in pregnancy. If it increases too far it can destabilise the rest of the pubic area, causing a lot of pain to groin, hips and lower back. It's not fun, but there's no "cure" except birth and it can last after that too. I'm seeing an osteo and may consult an acupuncturist if needed. It makes walking up & down stairs and rolling over in bed painful.

here's a definition:
Symphysis pubis dysfunction - Wikipedia, the free encyclopedia
Pelvic Girdle Pain

something else I didn't know about with pregnancy!

milly5 - I'm really going to miss the bellydancing. I was using it for fun as well as preparing for birth. Anyway - hope you're able to get back into it. Just remember no shmmies allowed until birth.