Excited but nervous

So I'm 10 weeks this week and my symptoms have eased up so much. I have bouts of nausea through the day, but I'm able to function now. I'm very happy about this but it happened fast considering I was so so sick for the past 4 weeks before. Is it normal for symptoms to just ease up all of the sudden at 10 weeks? Believe me I'm thrilled to feel better but I do worry since it happened so quick.