Burning pain at c section incision

I'm 15 days postpartum after a c-section. The past few days I've felt pretty good and close to pain free. Starting yesterday evening I had a slight burning pain at my incision and it's gotten worse today. Now tonight I can hardly walk because any weight on my left side gives me a serious burning pain on that side of my incision, like its ripping open and someone is holding a flame to me. I've had body aches for a few days but no fever. It doesn't look infected. Anyone experience this? I'll be calling my ob in the morning but just wondering if anyone else has had this happen.