Having Delayed Flares after PT

Hi everyone, I had surgery to repair a labral tear and hip impingement on my right hip 4 weeks ago. I started physical therapy at week two, and I've been finding that I get flare-ups hours after I finish PT. I feel great after PT, but I end up in pain later. The flares have been getting less intense, but I'm still a little concerned about it. My physical therapist said it's fine because the flares are getting less painful, but has anyone else experienced this?