Despite the not so good luck with the raspberry jam, I decided to try again with blueberries this time. The girls and I were invited to pick at a local farm with friends and the girls picked a bunch! I guess things are always more fun with friends!
I was pretty sure that the reason my raspberry jam didn't work is that I added the pectin too soon. So with the blueberries I made sure that I reached a full rolling boil and added the pectin for only a minute and this time success! Blueberry jam!