Spit up or vomit?

How do I tell the difference between spitting up & vomiting? I fed my girl (5 weeks on Friday) and within 20ish minutes (after I tried to give her gripe water, which she refused after getting a small drop) she brought up like a lot of her bottle. And then I went upstairs to change her clothes and she brought up even more. She didn’t cry or anything but then started with the hiccups. Does it sound like something to be concerned about? Sorry if it’s a stupid question. I’m a ftm.