I got the chicken pox vaccine for myself about 2.5 years ago. Only because i have never had chicken pox before. When i had my initial blood test for this pregnancy they have found that i still have no immunity to chicken pox. So basically, it didn't work. Is there any point in going to get the injection again?

I am also really curious as to why i have never had chicken pox. I have been exposed to it so many times in my childhood, but never got it. And now the vaccine has not worked. I find it kinda strange. Or maybe i am just lucky?