Irritated uterus

So Iv been having what I think is Braxton hicks on and off for couple of weeks. Midwife said I might just have a irritable uterus as at 16 weeks it’s a bit early for BH. Sometimes though I’m not sure if it’s BH or baby pushing out or my digestive system filling up with poop 😂 it’s not at all painful but my tummy does feel a bit hard sometimes but sometimes not all over. Any thoughts? X