Most adults in the UK have had chickenpox as a child and are therefore immune to it. However, about 3 in 1,000 pregnant women develop chickenpox. If you have chickenpox when pregnant you are likely to make a full recovery. However, serious complications occur in a small number of cases.
This is a companion discussion topic for the original article at https://patient.info/pregnancy/pregnancy-complications/chickenpox-contact-in-pregnancy