I had just bought my 1098 when I was in early pregnancy with Caitlyn... rode until the bump made it too uncomfortable (like Moira said, that whole muscles twitching that need not be twitching thing).
I think people should do whatever they are comfortable with within reason, I suppose. But everyone's definition of "reason" varies widely. The people that gave me the most grief were non-motorcyclists.. people who don't know how I ride. But I wasn't a high-risk pregnancy (in fact both of my kids were VERY healthy.. maybe a little too much at 9lbs 4oz with the first and 8lbs 5 oz with the second

).
In Ed's case, I think the heat would have been more of a concern than the riding itself.
Would I do it again if I were pregnant? Probably. Thankfully I got my tubes tied/snipped/burned with fiiiirrreee!!!... no more kids for me. Factory is closed, bitches.
__________________
Photography
"The Vincent was like a bullet that went straight; the Ducati is like the magic bullet that went sideways and hit JFK and the Governor of Texas at the same time. It was impossible."
- Hunter S. Thompson, Song of the Sausage Creature
"Be who you are and say what you feel
because those who mind don't matter
and those who matter don't mind."
-Dr. Seuss