chelsea It's baby sat on the nerves. I find sitting on the loo and trying to relax pelvic floor helps with the stabby pains. Also, circling your hips on the loo helps move things around and away from nerves. I've been doing preg. yoga moves to jiggle him.
Thanks for the feedback everyone - I always think the BH are just the baby pushing out his back as my belly goes hard but I guess they are BH. Really hoping for a plug this week, even if the idea SERIOUSLY scares the beejesus out of me.
better GBS in the UK - www.nhs.uk/chq/pages/2037.aspx?categoryid=54 - that explained it really well for me 
Just read your last post chelsea - wow! Hopefully they will pick up - good luck!