i think its 3 months, make sure if u do get it that you wait til you get your period and then go for the vaccine , even if there is only a 1 in a million chance you are pregnant.
I "lost" my immunity and had to have the vaccine , I had had a pregnancy blood test and it was neg ( but very early), so I called to schedule my vaccine and they would not do it til I got my period, I was SO LUCKY, I was actually pregnant and had I had the vaccine G-D forbid it would have been tragic.