4year old bumping jumping and kicking pregnant belly

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I’m 7 weeks pregnant and I have a 4 year old son. I swear at least once a day he runs into my belly or gives it an accidental hard elbow when trying to get off the couch. He climbs into bed to snuggle and then starts wrestling dog and I’ve gotten a kick to the belly. I’ve been trying to play defensive but the surprise attacks always get me. Any tips? Should I be worried? Do you think baby is okay?