It's a blog post by a doctor on the Zoe COVID study. She's basically saying that all women who've experienced changes and issues are imagining it. Or rather, it's real but it's not down to the vaccine
What do you think on reading it? I KNOW the vaccine delayed my period and then, when it came, it was really heavy. I know this wasn't down to a painkiller I may have taken or a spot of stress I had 
https://covid.joinzoe.com/post/covid-vaccines-menstruation?mccid=0bcd25dee2&mcceid=b394a53244#part2