Have you checked if you've got SPD or not? I think it depends if the pain is centred on your pelvic bone. I've started physio and it concentrates on exercising the pelvic floor and lower muscles - the physio lady explained that its like a basket holding the baby so we need to strengthen the muscles at the bottom. I guess that would make sense if you're carrying excess weight with the fluid etc?
Hope somebody else will come along soon with more wisdom than me!
Hi by the way - I've just come from the Sept thread!
It's not too probable so don't get worried, but this sounds a little bit like it should feel when the baby's head engages. 33 weeks would be quite early to engage but it doesn't necessarily mean anything if it has.
Is it your first baby?
It could be something else entirely but tht's just what sprang to mind.