I went to the ER for extreme morning sickness, they proscribed B6 and Zofran. The doctor said I could really take as many as I want because it only absorbs about 1/2 the dose. He prescribed 8mg every 6 hours. There were a couple times I had an hour or 2 overlap because I forgot when I took it. I found out that there is a lawsuit against its makers. Is it a safe drug? Have you used it?
In psychology they teach that correlation is NOT the same as causation. There is no proof that zofran causes birth defects but rather a correlation that mothers who have children with birth defects have taken zofran. I'm sure if you research it enough you could find a billion other things that could be the cause behind the birth defect.
Now don't get me wrong, I'm one of those people that is super against taking meds I don't need. So if you don't truly need the zofran, don't take it. But if it's gonna be the only thing keeping you from being hooked up to iv fluids at the hospital, then take them and try not to stress too much.