For second times moms...

When did you first feel your second start kicking?? At 16 weeks with my first I still didn't feel kicking but also had the placenta right against the outer part of my uterus. I'm only 12w 2d and I feel like a gas pop feeling but it's not gas and it's just at random times it could happen once or a few times in a row and it's usually in a specific area each time just wondering if it's my little girl kicking around?? She was veryyyyyy active at my 10w ultrasound.