When you're pregnant, there really isn't any drug that's safe for anything. It all has risks.
With my first, I was so sick and I was given an anti-morning sickness drug. By the time the second one rolled around, I'd heard there were issues with that drug, and refused to take anything. I ate crackers before I got up, sipped ginger ale, restricted foods that seemed to make it worse. I made it through. With number three, I had such a bad sinus infection I didn't have to think about morning sickness. I was given a mile medication to cure the infection, something so mild even newborns were given it, and threw it up shortly after taking it. I just quit. I hate throwing up, and it was violent vomiting. Urgh.
Not everyone has morning sickness, and sometimes it's very mild. We get through it because in the end we'll have a baby and it's worth going through anything for that. All three of my pregnancies had issues (two breach babies, possibly the first being breach also, though each time the baby either turned or was turned), labor was long and hard, but I wouldn't change a thing.