Only mirning sickness all day

Ni

I am 6 weeks 3 days today..

Have my first ultrasound not until next week. I just feel constant nausea kinda feeling in my gut and throat all day long except when i am eating.

Have no other major symptoms anymore. Breasts not too tender, not much of cramping/pelvic pains. Confused if everything is ok.

With this constant gut feeling i feel good only when i am lying down on my stomach. Is it ok to sleep on stomach or should i stop doing that?