Morning sickness suddenly gone with B6

My doctor suggested taking B6 Bc I had bad, all day sickness. I took the first pill last night and had mild nausea. Woke up this morning and took a second (recommended 3 times daily) and absolutely zero nausea or vomiting and was finally able to eat.

I am more than thankful that I’m not vomiting but also worried Bc the symptoms disappeared so quickly. Is that normal?