Is it bad to sit with my knees up?

Dr
Is it bad to sit with my knees drawn up to my chest? I'm nine weeks and I know later in this pregnancy I won't be able to do this obviously. But in the mean time is this a safe position to be in? I sit like this a lot, I've tried to stop but I find myself doing it without thinking. 
I'll be asking my dr of course but I dont get to see him till 14 weeks :/
Hoping one of you gals might know.