My morning sickness started IMMEDIATLEY & lasted ALLLLLLLL day for about 2 months. I had no other symptoms of being pregnant at all. I took a test just to be sure & yuhhp, i was pregnant. So i guess she should wait a week maybe to take a test since her period isnt due til then. I feel for her tho, morning sickness SUCKS..just tell her to be strong..shell make it through wether shes pregnant or not.