I went for an ultrasound and was 7 weeks and 5 days pregnant. The ultrasound doctor said the fetus was healthy. And before that, I had a lot of morning sickness and vomited a lot during the day. The week before, September 8, 2021, I weighed 47kg and on September 15, I weighed more than 45kg. Doctor, can you tell me if it is normal for morning sickness to suddenly stop during pregnancy?