Taking zofran for my entire pregnancy

Did anyone have to stay on zofran for the duration of their pregnancy? I became very sick at 5 weeks could not even keep water down and nothing was helping I was put on zofran and phenegran and for me the phenegran only works with the zofran otherwise I have no relief. I am almost 11 weeks and tried to stop the zofran and oh my gosh I am so sick again can’t keep anything down so I just took the zofran again. I think I might have to take it until the baby is born and I was just wondering if it’s safe l?