You have changed tempo for Z2 so it is very benefitial ride. And do not bother about lowerin intensity - not every day is “prime” day so sometimes it is good to take it a little bit easier to be ready for harder workouts. And when in doubt - Z2 ride is always an answer and provide a lot of benefits to your training.
What is important to analyze what caused you to lower the intensity? Muscles endurance, elevated HR, not enough fueling, bad sleep etc. If it was PMS maybe it is the info that this is not great time to do harder workouts than Z2 during these days. This will give you some more insight and create pattern for the future.