injected vaccines rubella Priorix 3 weeks pregnant.

Hi, I am 30 years old and pregnant for three weeks. On 7/5/2011 I have injected vaccines rubella Priorix. Doctors recommend that after 3 months to be pregnant. But on 7/8/2011 I was pregnant three weeks (from the date of fertilization).
I have a blood test on 07.08.2011 and the result is: IgG: positive 97.52; IgM: negative 0.53
At the moment,the index is safe, but I am still very worried because I do not know in three weeks before how the index like.
I want to know, at this point, the index is safe but in three weeks ago how they could be, is it safe for my baby.
I'm really worried and are looking forward to the advice of doctor.
Sincerely thank