Hi Poopie
Let me assure you that you don’t have tennis balls in there, you have a small person. And like big people small people are all different. Not feeling much movement before 20 weeks is normal. Yes many babies do reduce their movement at about 31 weeks but let’s be honest; they don’t have a calendar in there with them so they just have to guess the number of weeks that they are up to. Your baby is fine and I am sure that your baby will start to settle down soon. Just be aware that some babies even kick as they are being born, which I should imagine is a really strange feeling.