Is chicken pox dangerous to have while pregnant??

So I’m 38 weeks pregnant, I’ve had my chicken pox vaccine but I’m not up to date on my booster. My son has what I’m pretty positive is a mild case of chicken pox. He’s also been vaccinated, and they don’t seem to itch but he has had all of the symptoms just with a mild rash. If I’m going to catch it how many days does it normally take? How dangerous will it be for me and baby? I’m so stressed out about this 😩