Baby spitup?

BabyBlu🐼 • Mom of Irish twins
My LO is almost 4 weeks and for the last few days she has thrown up 2-3 times after each feeding. Its enough for her to choke on it and come up her nose. We have even tried keeping her upright for an hour afterwards and even then, a few minutes after i put her down, she starts spitting up again. Is this normal or could she have some reflux issues, if so, is there anything i can do?