Stomach aches at night :-(

Emma • Baby #1 - Boy 💙 born 14 July 2015!!
So I'm 7 weeks pregnant and the past few nights as soon as I get into bed I seem to have tummy ache? I can't seem to get comfortable and its like that until I fall asleep. Sometimes I'll wake up in the middle of the night with the same thing? Not sure if it's funny ache or cramps and don't know what cramps would feel like. Is this normal?