I'm sure it's just a typo but you started off saying peach tree, despite the title that mentions PEAR and another mention of PEAR a little later on.
OK I reread your post and assume you pruned what you know to be a peach tree and while you had the pruners in hand, decided to clean up a different overgrown tree. I can TOTALLY relate, as I have to restrain myself when I have pruners, loppers, and/or pruning saw in my hands. I tell myself I'm DANGEROUS and make myself put them down before I go overboard!
Not sure you are pruning pear tree right now if that's what you have. Pears should be pruned in late winter/early spring. Could be bad time for infections like fireblight. This IS supposed to be a good time to prune PEACH, especially for you a little further north than I am (I think it might be a little past the right timing for me here.)
Also, I wonder if it's a good idea to prune if the tree has lost foliage due to insect damage since you'd probably want it to grow back as much leaves as possible to recover photosynthesis area?
If the tree feels unable to support the baby fruits, it will probably abort them and drop them, but it will be able to concentrate on recovering it's strength since re-growing the foliage will take extra energy. How old is your tree?