It is natural to be concerned when pain shows up. We've all had setbacks along the way, it seems to be the way of things during recovery, except for those who are exceptionally patient.
I know I did - several times.
The thing I'd advise is to talk to your surgeon. I had pain on the inside of my groin muscles each time I took a step for three weeks running. I was concerned, immediately called my surgeon.
They talked me through things, calmed me down a bit and asked me to wait a week or so. The pain cleared up and never returned. Of course I also rested, iced, etc. I've no idea what the issue was, but apparently either a muscular issue, scar tissue that let go,
?
That was at about nine months. I had several other setbacks earlier.
My procedure for that was to get in touch with my surgeon to make sure they didn't think there was a structural problem. Once I talked to them there, I treated it as a muscle issue and waited for the pain to subside.
Call your surgeon, but I'd bet it is a setback like we've all had.