A 23-year-old woman comes to the physician because she thinks that she may be pregnant. She missed her last two periods and feels "different." A urine pregnancy test is positive and an ltrasound reveals a 12-week fetus. The patient is very concerned because she received the measles-mumps-rubella (MMR) vaccine four months ago and was told to wait 3 months before attempting conception. The pregnancy is desired. The patient asks if she should have a termination of pregnancy because she was vaccinated sholy before becoming pregnant. Which of the following is the most appropriate response?