baby or Braxton Hicks?

so I'm exactly 16 weeks. I've been feeling movements for some time now especially when I'm putting my daughter to sleep and she's on my stomach. I noticed just now while she's laying on me that one little spot in my abdomen feels like it's "tight" for just a few seconds very randomly. I can only explain it like when you're 39 weeks pregnant and baby stretches out and one part of your stomach feels all tight. it seems a little early to really be baby which is why I'm wondering if I'm just feeling Braxton Hicks. and if it is Braxton Hicks is that normal this early?