Dear hopalong 80,
If you have 24hour pain, no matter if it worsens with exercise and calms down a bit but not disappearing at rest, it implies an inflammation in progress. This could be due to fixation units. You didn't mention pain before initiation of physio treatment, redness or a mild swelling during the day and night, as well as night pain. These could lead one to hypothesize inflammation in progress.
In any case, if symptoms remain the same or get worse in the next 2-3 days, I would suggest ceasing of physiotherapy and a visit to your MD to exclude any side effects of the surgery.
ilias