I feel so early compared to everyone else

I'm 16 weeks and two days and I can feel my baby ball up to one side and huge movements. Today I've been feeling the baby kick, I felt something unique, I can't even explain, and I would put a little pressure in that area to see if I would get a response, and surely enough I did. Am I to early for this? I felt flutters at 13 weeks and 5 days. Anyways, I've only gained 3 pounds and I was underweight before pregnancy. (Please be nice)