My sis is pregnant 1st time . and she got chickenpox, what to do?

Wait it out: There is variable effect of Cpx during pregnancy.The worst risk occurs if mom is infected and symptomatic around the time of labor.In this interval she and baby can both have severe complications, but they can be managed medically with good outcome. Less than 5% of those infected during early or mid pregnancy will show any effect on the baby.