New mom here

It’s my first child and I would just like to hear from previous moms just concerned with how my stomach feels I’m thinking because it’s the first time my uterus is being stretched out is it normal to feel like you just worked out and your stomach is sore from working out sometimes when I press on my pelvis i can feel pressure thinking it could be built up gas. I’m not in pain just uncomfortable

I’m 18 weeks and 5 days

Trying to explain this the best way I can but it’s so hard to explain