Hard lump in lower abdomen

MLyon

Hi! I am currently 14 weeks + 5 days along and I've noticed a hard lump when I lie flat on my back. It's in the bottom left part of my abdomen and it seems to have gotten larger than when I first noticed it a couple of days ago. My next appointment with my doctor isn't for another 3 weeks, so I was curious if anyone else had experienced this, and had any thoughts as to what it could be?? I thought at first it was baby growing but would the "bump" just be in one area? Clearly first time mum here! Thanks in advance :-)