Did the morning sickness got better from week8? Because my morning sickness was not as bad as week 6, 7. Is that normal?

My wife is in 8 week and she is badly suffers from morning sickness .she had it all over the day.After every meal within five min she vomite everything . doctor said nothing to worry its natural and avoid giving any vitamins as well. Waiting until she gets better. (cross fingers)