I just woke up (full bladder) and was laying on my back and felt my belly. I freaked out because I felt a lump on the left side of it, like it was bigger than the other side. Of course I thought maybe it was baby, but thinking I couldn't possibly feel baby yet thought maybe it was a tumor. I put the doppler over it and got baby's heartbeat! After a little bit, the bump went away. Am I going crazy? Did this happen to anyone elss? I'm petitie, before pregnancy having a flat stomach, so maybe I'll feel it earlier?? I am nearing the end of week 13.