Is this normal?

I had a c section 3 weeks ago tomorrow, after day 6 I was feeling great stopped all my pain medicine but for some reason the past 2 days I’ve been really sore. I haven’t really done anything different, should I call my ob to be sure or is this normal? I know I had a major surgery and I can still hurt but I’ve been feeling great. My lower stomach is kind of tender and it hurts to touch.