AimeeL85:I would ask - they know your track record and I would just mention that you worked up until delivery with the last two (something like "I had hoped to be able to work up until delivery like I did with both of my previous pregnancies, but..) just to remind them of that. As long as your other LOs won't be home and you'll be able to get the work done, it sounds like a great compromise.
Yeah, I would mention that as well as mention that this pregnancy you have dealt with "some unforseen medical issues" that make it much more difficult at work this time, but you feel confident that you would be able to work from home and your OB supports this. Most bosses know they can't really dig into your medical issues, plus he knows your work ethic already.