Zofran and pregnancy

I'm almost 9 weeks pregnant and have been having a horrible time keeping food and liquids down. My doctor put me on Dicgleis and it hasn't been working because I'm still getting sick and still have nausea. Now my doctor is prescribing Zofran...I'm worried about all the mixed reviews about birth defects with taking it. are there any mothers out there that have taken it and had normal babies? I'm so nervous about this. Please help