You baby could be balling up and that's why you feel pressure idk why it feels sore though !
I meant that's why your stomach could feel hard !!
I may not be much help but Im 19w 2d and my tummy is now pretty much always hard. I have a very visible bump! I also feel the tightening feeling which does feel like a ball rolling around. I also get what others have told me are round ligament pains- your uterus stretching. I usually feel that down the sides & lower. I don't think I've experienced BH so don't know how to explain those.
Since you are feeling sore when it happens, id call your doc quick or is your next appt soon? My guess is its a normal pregnancy feeling but always call to ease your mind, i do. And especially call if it gets worse. I hope you feel better... and Congrats!
Thank you both.
Think ill ask a doc about it. It feels like his rolling round n I watch my stomach it rises up but it hurts.