In this case scenario, the doctor should advise the patient to wait and watch. The vaccine should not be administered during pregnancy. If pregnancy occurs within 28 days of immunization, the patient should be counseled on the theoretical risks for the fetus. Studies of over 200 women who had been inadveently immunized with rubella vaccine during pregnancy showed that none of their offspring developed congential rubella syndrome. Therefore, termination of pregnancy is probably not warranted Reference: Ananthanarayan and Paniker&;s Textbook of Microbiology Tenth edition