mmr vaccine??

Hey everyone, I am sorry if this is not the right post but I had a question. So I recently got a job and My titers came back showing I need to take the MMR Vaccine because I'm not immune to it. So I went to go get that done today but they asked me if I am trying to get pregnant or if I am pregnant and they said it's a huge risk to take that while pregnant . So I grabbed a pregnancy test from my local Wal-Mart and it was a BFP but now I am at a loss about what to do. Are there any exemptions to taking the MMR Vaccine? I really don't want to lose my job