Vomiting blood

This may be to much, but I honestly don’t know what to do. I am currently 17 weeks pregnant and I started throwing up at about 8 weeks. I have noticed that I do throw up blood. I’ve told my doctors but they say it’s normal. But tonight I started throwing up fresh blood and it was towards the end of throwing up. I have also had problems with going to the bathroom and my stomach feels like it’s on fire occasionally. Is this normal?