Zofran for Morning sickness!?

Emma • 19 mo twin boys 💙💙 7mo baby boy🤰🏼 baby #4 is a GIRL 🎀 on the way!
So my morning sickness is literally all day now! I'm beside myself sick! I've tried B6 vitamins, maxolon and have just been prescribed Zofran 4mg tablets! I have taken one and i feel SO much better! 
However I have seen a lot of conflicting info about it on google! Who has taken it and do you think it's safe?
I'm 7 weeks with twins