Toddler kneed me hard in the tummy

And now I'm kinda scared. I'm cramping. This is twice he's done it! He's 2, and gets exuberant with his mommy in throws himself at me full run because he gets so happy and excited ☺️ I tell him to be easy with mommy because there's a baby in my tummy. But...he's 2. I have my NT ultrasound in the morning luckily, but just wondering if anyone else has had this happen.