Why stop???
Like you I am on the go all the time and I will continue to do so right up until I give birth I imagine.
I have four boys on school holidays at the moment anyway so not alot of chances for a rest but I also figure if I stop I am just going to think about what needs to be done, what I should be doing or what I could be doing.
I still have 10 weeks to go but I cant imagine sitting around waiting for 10 weeks I would seriously drive myself insane so no thanks.
As long as you arent pushing yourself and you are still feeling good do what you want and dont listen to anyone else. You know what you are capable of and its your body that will tell you to stop when you need too.
Oh and the rice flour is at Woolworths. It comes in a little box by all the baking stuff I think it was.