How early?

How early did you ladies find it uncomfortable to sleep on your belly? Honestly, I'm not sure how far along I am, I got my first bfp 2 weeks ago and won't see my dr for another week I know. The health dept confirmed my pregnancy and said I was 11 weeks (I know they don't know without an ultrasound) HOWEVER, I get cramps sleeping on my belly or even laying on it for a short amount of time. I didn't know If this was common in early pregnancy or usually later. I'm trying my best to get use to sleeping on my side, but it's rough. Lol