30 weeks today, baby hardly moving

LJ • Baby girl born Feb 19, 2015 and second girl born Jan 20, 2017. Baby #3 due in October!
I don't want an unnecessary trip to the doctor so what are some tricks to get the baby to move. I was just at the doctor two days ago for my bi-weekly check and everything was good then. I think I've felt her a couple of times today but not her normal movement.