Zofran

My doc prescribed 4mg of oral Zofran because I have Hyperemesis Gravidarum. I cannot keep anything down including water, but I’m terrified of taking the Zofran due to all the birth defects it’s been linked to. I’m 9 weeks pregnant and don’t want to risk any birth defects because of this med. it’s the only one my insurance will cover :( Someone tell me it’s perfectly fine to take. I’m losing my mind with the constant vomiting.