Sometimes I still can’t feel baby....

I’m 26 weeks and sometimes I still have a hard time feeling baby. Is that normal? By this time with my first she was beating me up! With this one sometimes shes really strong and constantly moving and some days I guess she’s lazy... Worries me a little. My doctor said to just make sure I’m getting at least 10 movements a day and I definitely do just sometimes they’re weak and I really have to pay attention and sometimes they’re really strong and very noticeable.