Back very sore from epidural!

Madison💁🏼‍♀️ • Retailer// Married 6 yrs// Mommy to fraternal twin girls// surprise baby on the way!
I was fine after delivery but now at almost 3 weeks postpartum, my back is very sore where I got the epidural all of a sudden! Is this normal? I took naproxen but haven't really noticed a difference. I have Percocet for my stitches (twin A gave me a 2nd degree tear) but I've been off of it and hate to take it again.