Advice needed

I am currently 14 weeks pregnant and a preschool teacher. I found out through blood work that I am not immune to rubella, my doctor said Sam vaccines can wear off and she assumes that’s what happened since I was vaccinated as a child. I came back to work and immediately asked my director if all of our children had to be vaccinated in order to come to school and she responded with yes everyone Hass to be. I found out today that two children in my class have never been vaccinated. I was immediately upset that my director lied to me knowing the risk if I come into contact with the child or anyone who has rubella that my child will be born with serious birth defects or not make it. The director told me before she walked out of my classroom that they’re not the only two not vaccinated there’s a bunch of children at the school but that was a private matter and none of my business. What am I supposed to do? I don’t think quitting is an option. But at the same time how am I supposed to come to work everyday knowing my unborn child could be infected? There is nothing I can do until I give birth and then I’ll be vaccinated.