This question is going to be tmi?

ok yahoo...this isn't kris this is actually her husband but my question is...my wife and i were making love and i felt her stomach get real hard on side...she said it was the baby crowding to one side...is that normal...do all babies do that in utero or was it something i did to make it do that...she said after the knot went away that she could feel it moving alot...is that normal...with the first pregnancy i was away for a while so i didn't get to experience early pregnancy stuff with her...and when i did get back she experienced something similar the first time and she started having contractions but her whole belly got hard...should i be worried...she tried to put my mind at ease and said she was fine but i'm still a little nervous...could any of the women help me out...