text: how fast can you start to expereince morning sickness? is it possible to have morning sickness in a matter of a day or two or is something you generally experience after a few weeks/months? i think it varies.  i had morning sickness right off the bat, but my friend never had morning sickness.  i also had it worse at night - don't know why it's called morning sickness.  eat crackers before getting out of bed.