Same! Knee shots 3 times, period returned avg of 11 days later, all 3 times.
I was about 2 years past that time of life - thrown into hot flashes, night sweats and then the bleeding.
I had a battery of tests and my orthopedist still says he has never heard of this correlation.
After reading all these posts, I wonder how that can be?!
I do feel the unwelcome side effects are a fair trade off for mobility.
I just get to slosh around for a few days 🙂