11 week 2 day

Yesterday I went in for a flu shot. My midwife asked me I I wanted to hear the heart beat an once again it took a little while but we found it. It's so amazing to hear my little munchkins heart beat. But it was weird I guess the baby kept moving cause once my midwife would find it would disapear an move somewhere else. She said I already have an active baby. Has this happen to anyone else?