I'm due September 29th. Got a lot going on down there too. =p
I spoke to my midwife today and she said it is perfectly normal and that it the bone seperating a little in preperation for the birth. Hope that helps a little.
Im 31 weeks and the bottom of my pubic bone has been kind of sore/tender for the last few days. Im not sure what it is, glad to know someone else is also experiencing something similar.