Prenatal Vitamins

So I didn’t take my vitamin for like a month now. I took one this morning because I haven’t taken it for a while so I just took it. 14-15 mins after I started throwing up and 1 minute after I took it I started feeling nauseous like when I Very first took it. But this time I threw up which never happened before. Can I change my vitamins? I got the original ones the Doctors be prescribing.