I wish to get pregnant but I am in contact with a person with Cytomegalovirus (CMV) infection?

Hi. I am a 38 female school teacher who has a 6 year old boy in my class with diagnosed Cytomegalovirus (CMV) virus. I wish to get pregnant in the very near future but am afraid to do so while this child is in my care as I have heard that it can lead to severe disabilities in the unborn child. Can you please tell me what you recommend I do as a doctor? Should I avoid trying to get pregnant as long as this child is in my care?