Nausea medicine

I've been quite nauseated since getting pregnant and vomiting often. I've lost 2lbs in the 3 weeks since I last saw my dr. Today he gave me this medicine to help cuz he's worried about the weight loss. I'm terrified of nausea meds since all the stuff came out about zofran  but I read that this is the only fda approved med for nausea in pregnant women so that helps a bit. Just wondering if anyone else has taken it before?