This is an article about "anecdotal testimonies of sudden, early, disturbingly prolonged, abruptly absent, extremely painful, or unusually heavy and clot-filled menstrual cycles post-Covid 19 vaccination."

The author poses the question - why have there been no studies done on this side-effect?

I could tell him why - any adverse data that may add to 'vaccine hesitancy' is banned. It's that simple.