If in doubt, definitely throw in another rest week. Like @russell.r.sage said, you could very well be overreaching so the recovery takes longer if you’re not used to the volume.
Similar thing happened to me two or three weeks back: Failed Recovery Week, add Another?
Adding that extra easy week (and actually making sure it was properly easy) made a world of difference - I felt fresh and ready, even added another few W in my ramp test from a week earlier.