I'm 19 weeks too and my baby had just started being very active in the last week. Before that I had only felt it occasionally, now it's several times a day
That's totally normal, my daughter started to be really active around that time and never really stopped, even towards the end when most babies quiet down she was kicking up a storm and since she was born she hasn't stopped wiggiling, so maybe you'll have an active baby(:
I'm 28 weeks and have an active little boy it's a good thing at least you know all is ok :)
I'm 19&2 and my baby has been really active for a while. I don't see how that would've a bad thing at all.