Rubella non- immune?!?!?

💖Amanda • Have a 5 year old from my previous relationship. Now married to my true love and baby #2 is due aug 2015
I just got my tests back from my first dr appointment and to my surprise I'm not immune to rubella even thou my mom swears I was vaccinated..... What does this mean for me?  With ppl who exposed millions of people to measles in DISNEYLAND and now it's been found at a game place in the Bay Area where I'm visiting????