Back pain after epidural?

I’m 4 weeks postpartum and I’ve been having back pain around where I got the epidural. it just started recently so I’m not sure if it had to do with the epidural or what but it’s in the same place. I had a 21 hour labor and pushed for 2 hours, and I’m not very big (I was 143 lbs when I gave birth and now 120 lbs) so I don’t think it’s my weight. I’m worried they messed up my back when giving me the epidural :( I regret it if they did, because my blood pressure dropped to 52/30 so they had to turn it off anyway