What should do to stop it if you are suffering from one week symptoms of pregnancy?

If you have morning sickness then eat dry soda crackers to settle your stomach. When you see your doctor mention this and he/she may give you something to stop it. Vomiting for too long a period of time while pregnant isn't a good thing. You are just into your first week of symptoms so you are just fine. You are going to have many more changes to your body being pregnant, so eat well, lightly exercise, be careful what you eat and drink (no alcohol) and keep your doctors appointments.