Is it normal to vomit blood during pregnancy?

Yes, you need to consult a doctor immediately. You will need medication to stop the vomiting and advice on type and frequency of meals along with Vitamin B supplements. You need to be checked out for dehydration as well as reason for blood, which could arise from loose teeth/gum infection/ gastritis/ mouth ulcers/incidental one time bleed. Bland food, with less oil/spices/ dry taken in small frequent meals with no early morning empty stomach- could take care of most of your symptoms. If not handled well and in time- it can become a recurring condition and more serious needing hospitalisation.