With my oldest son, I thought I was one of the lucky few with no morning sickness... I was 16 weeks and doing GREAT. Them at 17 wks, I was walking through a parking lot, and this car started up with really bad exhaust fumes... . The smell was awful! I had just walked in the store, and just puked right there! From that moment on, screw "morning sickness", I was stuck the minute I woke up til I went to sleep. This went on strong for about 3 weeks, then continued not as strong for 3 more. I lost about 10 lbs and was scared I was too skinny for being almost 5 months pregnant.... My lips were chapped, cracking and swollen from dehydration, I couldn't even keep 2 oz of water down before noon. By lunch, I was both starving and dying of thirst! I learned the hard way to eat VERY slow...
Those few weeks were rough!
With my second, I was very nauseous, but never actually sick, lost my appetite for my first trimester...