Help first time mom with a newborn!!

I’m not sure if my newborn is sick or what’s going on!! I’m so worried she is 3 weeks old and she’s started gagging and then few hours pass by she threw up! She has been having a lot of saliva when sleeping… is this normal? I’ve been feeling a bit sick myself? Should I take her in? Currently as I’m writing this she spit up after eating! She is breastfeedand has no fever