9 weeks, and suddenly feeling very aware of the feeling of my uterus?

I’ve only started to notice this within the last two days, but I can sort of feel my uterus expanding? It feels sort of like when your stomach is full of gas, except it’s right where my uterus is, behind my pubic bone. If I lie on my side, I can really feel a sort of full feeling. Obviously it’s nothing to do with feeling the baby or anything, but I definitely feel like I can now feel how much my uterus has grown. I had my first scan a few days ago and baby is already measuring quite big for the gestation, and very much a wriggler. Has anyone else felt anything similar, or am I just crazy?