Initially I was more like it's really hard to tell. My cycles never changed from their normal during the pandemic, a time of high stress so I can't just easily explain it by stress even though cycles can be very much affected by them. I was on mine when I got the second dose. It lasted 9 days (normal 5-7). 8 days after stopping I started again with a 5-day one. My original next one was supposed to be May 17th, my tracker changed that to June 2nd, but today I started again (a few days early just like my first one that I was on when I got the second dose was). I would have chalked it up to stress but it just doesn't happen to me to have a period 8 days after stopping. I'm guessing mine was a one-time disruption but am tracking it for my own purposes.
FWIW an interesting article I read today was discussing efficacy of the covid-19 vaccine with women in somuch that is ever so slightly less with women than men and that hormones such as estrogen may play a role. They also mentioned this in terms of side effects. I didn't even know this but in the U.S. it wasn't even required to include women until 1993 when before trials often excluded women.
During these trials (many trials) they don't really ask for menstrual cycle changes, so hard to say no to something that wasn't studied. It does seem that this question of is it or is it not impacting cycles is drawling attention to this so I'd say that's a good thing.
I think the musings were initially dismissed until more women came out and discussed changes. Your cycle can be impacted by a lot of things so it's hard to pinpoint things but I'm going to be inclined to believe a stronger correlation when it comes to situations like me and women who were in menopause restarting again. I think one of the bigger things will be delving into ones that more closely match someone's cycle from those way off.
I'm also confused is this the same Jen Gunter that said the following: "Dr. Jen Gunter, an obstetrician and gynecologist in the San Francisco Bay Area, said a link is possible, since the uterine lining, which is shed during menstruation, contains immune cells that help protect the uterus." (this was from early May). Where did she say it was BS or was this a different Jen Gunter?