My kitties usually don't have reactions to the vaccinations, but I have had a couple who were like that. I'm sure they'll be fine, but as your vet said, it wouldn't hurt to stop them by for a quick check.

Reece had a bad reaction to vaccinations once. He's had them 5 times with me now and only that one was bad. It was really weird that he just had it that once. Maybe your kitties won't have as bad of a reaction next time. Just something to think about, but I'm sure your vet will advise you and talk with you about what is best. Be sure to tell them your worries about it.