I just found out I am pregnant and I am waiting for nausea like it is compulsory. My cousin started vomiting very early, so I keep comparing myself. In which month did it start for you?
Mine started around the 6th week, so basically 2nd month, and lasted till almost 4 months. It hits different for everyone honestly. Small frequent meals and ginger water helped me a little.
Generally around the 6th week. But if you cant keep any food or water down and feel very weak, dont tough it out, call your doctor. Severe vomiting needs proper care.