Almost 3 week old keeps vomiting

Christine
Let me just say I'm calling dr in the am. But I'm looking for some other moms who might have been through this. My daughter was born September 19. And after she eats she vomits. But about 30min to an hr later. She is throwing up alot. It appears to be about an half of what she ate. She has no fever and this just started this morning? Can this be a stomach bug ? Or any moms have babies with reflux? Thanks moms