It's Braxton hicks. I started getting them at 16w andget them every now and then. II'm 25w now. Don't worry, it's completely normal
It is so weird stomach is really sore now.
Braxton hicks would be my guess. If you research them you'll find that they actually happen the whole way throughout your pregnancy but your uterus is too small for you to feel it in the earlier stages. Some women say they don't get them at all, but they do they just aren't noticeable for them. You might just be more sensitive to them then others :)
I had Braxton hicks contractions when I was around 17-20 weeks so 16 weeks isn't to early its normal
I wouldn't think this early though?
Braxton hicks contractions maybe