First time using dildo

It was my first time using a dildo (7 inches)for anal and to clean up I used an enema. I felt no pain at the time but now a day later I feel pain right above my bellybutton. It gets sharp if I really jam my fingers into my gut but it feels like my arms do after a day at the gym. Also my stools are normal and no blood came out so I’m wondering did I strain a muscle or is it more serious?

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