Hi my dear,
It is perfectly normal for a pregnant lady within the first 3 months to have stomach pain or nausea
. Do not worry, once you will feel your baby movements, you won't have such problems again (around the 4th month).
What I suggest is to eat often and small portions and the foods you can digest.
If you cannot digest any food, talk to your doctor if you can start any anti-vomiting drug. Do not take any drug without consultation to avoid baby damages.
Drinking lemon juice with soda bicarbonate can help.
All the best to you and your baby:)