This is my second baby and my boyfriend can already feel the baby kicking and I'm only 17 weeks, I…

This is my second baby and my boyfriend can already feel the baby kicking and I'm only 17 weeks, I was just wondering if that's normal or should I talk to my doctor? It might be a normal cause I didn't let my body heal after I had my first baby and I'm due in September and my first baby is 9 months tomorrow! She's my little monkey!!!!!!!!!