Morning sickness is the most common problem in pregnancy, and it’s said at least half of all pregnant women will experience it to one degree or another. Some studies show as many as 80% of women will experience morning sickness during pregnancy. Some mommas will only experience nausea in the morning, while other’s it’s an all-day-all-night problem. It is believed that a combination of factors play a large role in morning sickness, including sudden hormonal changes, like a rap