Mine "popped" at around 12 weeks LoL....Im a small girl and could feel mine if I lay down and suck in a bit. You should be able to feel the top of it. It feels hard and rounded off at the top. Now that im 19 weeks I can feel a lot of it since the top of it has made its way to my belly button. It now feels like a cantaloupe under my skin.
Wow I'm 12 weeks as well and I wonder of gnats what happened to me cuz I'm very petite and notice a hard round like feeling at the bottom of my stomach. So exactly what does that mean? (Uterus popped) excuse my ignorance. Lol
Finally get big enough to be felt above you r pelvic bone xxxx it doesn't pop or anything uncomfortable xxxx
So yes I would say you have finally popped lol xxxx enjoy xxxx