Mine stopped somewhere between 16 & 18 weeks. I think the severity (all day sickness, non-stop throwing up) can be attributed to a certain degree to stress as Rosy mentioned in her post. I was working in a high pressure sales & underwriting position for a major insurer and I would drag my green self into work every day and throw up non stop all morning until they often sent me home. The rest I blame on all of the extra female hormones racing through my body! *LOL*