Just had a look for the original BBC story saying essentially women are imagining it. Can't find it. That's odd they usually link previous stories.
Anyway it's all irritating.
On the one hand when you go to doc they often ask when was last period. I never tracked them so was always at a loss. They always seemed disapproving that I didn't. As if it were odd.
Also questions- are they regular, any changes, could you be pregnant etc etc
Whatever posters views of tracking or not it seems to be expected that we will note this biological function and changes and spotting and is it late etc etc.
So this happens and all the women who are taking note say hold on this has disrupted my periods. Initial reaction in media with reassurance from docs. Women are probably hyper aware of looking for side effects of vaccine. Irregularity is normal. Over reaction. No reason to affect periods. All anecdotal.
Now it's hmm there may be an impact but probably it's temporary and nothing to worry about (although we don't actually know what's going on yet).
Periods are a complex and involved biological process. Amazing really. Womb gets ready to grow a fertilised egg. Egg gets released to coincide. If fertilised commence baby growth. If not. Discard the preparation for egg and start again.
Something that disrupts periods could be temporary and all fine. Or not.
They don't know. The knee jerk is to reassure the ladies so they don't get silly ideas in their heads.
If thousands of men were saying that their dicks were misbehaving would the reaction be the same?