why is my morning sickness not severe at 7 weeks

Brittany
I am 7 weeks and have very little morning sickness. With my first two (girl and boy) I had severe morning sickness. To the point I could not even get of the couch or keep anything I ate down. I am 7 weeks and as long as I eat often I don't feel that sick really I just feel hung over. Is this normal I am freaking out!