Oh sorry I thought it said 10 for some reason
It's probably bloat. Your uterus is still pretty small at 10 weeks. Barely above your pelvic bone.
Are you sure you aren't just full? I'm 25 weeks and my stomach sticks out far on the top when I eat too much
For me it's the opposite the bottom of my belly sticks out and its hard an the top is not I can't believe I'm already showing I'm only 10 weeks