Vagina jabs

Help. Over the past few days my boys movements have changed... now I don't feel him anywhere else besides my vagina and pressure in my butt. I literally stop in my tracks and close my legs because it feels like he might pop out when he moves. I've been achey and crampy the past few days too. I know he isn't but that's how it feels. Is that normal? I'm 28 weeks it's kind of freaking me out. Waiting on my doc to call back