I started feeling LO right before 16 weeks. To me it felt like a muscle twitching a little below my belly button. I wasn't 100% positive at the time that's what it was but as the weeks have gone on, I can say with certainty that's what I was feeling so early on. We just had our a/s on Monday at just past 19 weeks and I watched him punch me and felt it at the same time. That was very cool!!
Everyone feels LO differently so it very well could have been baby!