Probably at the end of its auto adjustment so go gentle with it. In some (all?) cars the pedal weights up significantly, when my Iveco had its new clutch I hurt my foot as the pedal went down so easily I bottomed it out on the floor 🙂 Not surprising that driving it had been giving me knee pain!
It will normally start to slip in the higher gears which can be quite hard to detect when it first starts, dipping the clutch whilst accelerating in 4th and 5th will give you an early warning that its actually on its way out as the rev counter will spike and won’t immediately drop back down.
Driving at 70mph and not realising thats its slipping is the quick way to kill it, if you notice and drive appropriately you may get a few more days out of it whilst you sort out the repair.