I'm a type II and have gone through a diabetic pregnancy myself a couple years after my diagnosis. I can think of a couple things that may be going on. First is the baby got hungry and took what blood sugar you had in your system-I crashed several times in my last trimester because of that. Two, despite the sugar there is quite a bit of fiber and other stuff in pears that could make them digest more slowly. A third possibility is the before delivery drop in blood sugars when the pregnancy hormones drop. They said about a week before delivery, for me it was about three weeks before delivery. It happened so fast I just about ended up on the floor at the store. Being a type one you probably have a better ability to guesstimate what foods will do to your sugar than I do.