Spit up

Sarah • I have two beautiful children a boy and a girl. TTC baby #3
My 6 week old is spitting up more and more, at least it feels like it to me. Before it was small amounts and now just like 5 minutes ago it's like she spit up a 4 Oz bottle whole. She is breast fed so I'm not sure exactly how much milk she is getting but on days I work she takes about 2 to 8 Oz while I'm gone for 5 or 6 hours. Not just one feeding. I'm getting more and more worried. My son never spit this much up. And it's like 20 minutes after she feeds. I do my best to burp her am I not doing it right? Most the time she'll burp but she is hard to burp. Sometimes I have to move her body for her to burp. What do I do? She has an appointment on March 9th.