It's not always true that you feel them sooner. I felt this one at the same time as my first- just after 19 weeks, but I know women who haven't felt their second until later. As long as everything says baby is good, try not to be concerned.
Yeah I'm on baby number 3 week 32 and I'm very small figured and my Boys all 3 were different in fact my first was the soonest I felt!
Everybody is different! I know someone preg with their second and they didn't feel baby move till around 20 weeks