Nausea medicine? Yes or no?

Alixandrea
I have hyperemesis gravidarum or severe morning sickness. I have had to go to the ER a few times just to get fluids. I was then prescribed zofran to help and surprisingly it has helped a ton! 
I made the mistake of posting on Facebook about taking the medicine and many other mommies jumped down my throat to tell me how terrible I was for taking it because it causes birth defects. 
I'd like to know what everyone here thinks. Has anybody used zofran or another nausea medicine and had a child with birth defects?