Pain after physiotherapy

Im 9.5 weeks out from my L5/S1 MD. I still had buttock pain at my 7 week follow up with my surgeon however he signed me off for physio and hoped that would then help alleviate the pain long term. So I started physio 2 weeks ago, my PT gave me some light stretches for week 1 - Side to side knee drops and pelvic tilts, then in week 2 he introduced figure 4 stretching along with a half cat cow. He also advised me to go back to swimming. Unfortunately the last week has resulted in a return to my leg pain in a big way, my buttock pain went through the roof and all the sciatic pain returned into my calf, top and bottom of my foot. Ive laid off the exercises for a few days which slightly calmed things down. Did this happen to anyone else when they resumed PT? This feels way more extreme than normal aches and pains of healing, I had reherniation ruled out through MRI in week 4 but to me something still doesn’t feel right. Any advice?