Pregnancy at Week 11

I have gastric before pregnancy and usually need to eat but since pregnant i got no appetite and nausea but feel abit hungry. If i eat a bit depends what i eat(biscuit,bread)..i will tend to vomit. Sometimes is just vomit water with bit of blood. i lose weight more than 5kg since i got pregnant. Is this normal? I m so stress😣#advicepls #1stimemom #firstbaby