It is now recommended that you get two doses f the chicken pox vaccine as it provides a better immune response. But, as you have discovered, you can still get it despite getting vaccinated, but it ill be a much milder form.
I've never assumed vaccinating prevents the disease, I always thought it wouldn't be as bad as if they were not vaccinated, and the more people that vaccinate the weaker the disease gets.
Nothing is guaranteed. There is a chance that if you contract the disease, that it won't be as bad. A chance. No 2 people are the same. The same as there is a chance the immunisation won't fully protect you.
From what you have described, your DS has a mild dose. I don't know if he's in the early stages or not though.
DD2 had them at 6 months old & they were pretty nasty. It was an absolute nightmare. None of my other children have contracted CP though, despite the fact that I'm 99% sure DD1 brought them into the home.
My understanding of the chickenpox vax is that breakthrough pox is fairly common - however it usually a much milder form of the disease - fewer spots, lower temps, get better more quickly and are less likely to infect other children (because the total germ load is less) although still contagious.
FWIW there's no way to know who your child "caught it" from. Chicken pox is fabulously contagious (via sneezing & coughing) even before the spots appear, so there are likely to be a number of children at the school who have it.
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