6w5d pregnant

Is it normal for symptoms like nausea and breast pain to come and go? Last night I was worried Bc I felt great for the first time in about a week but this morning I'm starting to feel a little sick again. It's just been nonstop for a week or so now so when it stopped last night I was scared. Those are the only symptoms I have so far. Isn't it crazy how we feel better knowing we're sick?