I'm not a nurse, but my mom was. She quit her job to stay at home with us when my little brother was born about 10 months after they adopted me. She didn't keep her license current, but her understanding was that she could get her license again after taking a few classes to get the most updated information. I don't know if that's how it really works, but maybe you could ask someone from the school where you got your certification in the first place. I'm sure they would know.
BTW, my mom never went back to work. She loved being at home with us and never looked back. She's a grandma now with only a 13yo still at home and she has no regrets.