i think its either your uterus or baby or nothing to worry about..i had this except mine was over on the side of my abdomen, not very centered and i asked the doctor about it she wasnt concerned she mentioned it maybe being some intestine? idk about that.. but i definitely think it is your baby or uterus and totally normal!!!
Hey, this sounds very much like your uterus growing, i spk from experience, and from my experience, thats what the uterus was like for me around 11weeks. Please dont apply pressure to it though....it will be uncomfortable and not pleasant for your growing baby. This is just you growing....so dont panic. Its your little one.... :)