Baby keeps throwing up

Every single time she feeds today she throws up . She’s on formula and breastfeeding as well. This has been her routine since she was born. Nothing changed. I gave her formula and each time she threw it up I gave her breast milk to see if she would and she threw that up as well. So she’s constantly wanting to eat I’m not sure if throwing up is making her tummy empty again. And it’s not just a small puke. She didn’t even want to latch on to my breast today she sucked for a little and kept getting off and falling asleep. She’s one month I’m not sure if this is acid reflux or she’s sick? What do i do? Anyone’s kid been through this at one month? Yes I’ve been burping her. She she throws up after she burps as well