First time Mom question

I'm almost 7 weeks pregnant. For the past 3 weeks i've have horrible nausea ALL day long everyday. Last night I couldn't sleep I felt so sick. I puked for the first time and actually felt way better after. Usually I have no urge to eat anything and just looking at food would make me sick. Today I ate what I would normally eat if I wasn't pregnant and I was okay. My nausea seems to be gone and I have craps in my lower middle back. Is this normal?