This is my first PG and I felt a small kick just before 19 weeks, although I wasn't sure if it was or wasn't baby at the time, and only felt it as I laid on my stomach to go to sleep and off it went, just 1 single kick. A week later got the same small sensation again. Then about 2 or 3 days later started to feel like a 'popping" sensation on a daily basis.
I wouldn't say it felt like butterflies at first, which is how people had described it to me, more like someone was letting off one of those things were you turn it inside out, put it on the floor, and it pops up. Felt like that against the inside of my stomach. Now it's just kicking like a punching sensation. The "butterflies" description I think, or from what i've felt, is like the baby runs it's arm or leg against the inside of my stomach so it's a really fast flutter across the belly.
I absolutely love being able to watch my tummy and see the kick's now, makes me giggle every time!! Gotta love it when you are lying watching TV and the baby makes your PJ's visibly move!!! hehehehe
Be patient and I'm you'll be feeling them in no time.
Once you feel them, then comes the frustration of you being able to feel them and waiting for others to be able to feel it. My sister felt the first one while we were at a concert and I'm pretty sure baby was dancing!