I'm in the Pfizer study and also on the 1a list to get the vaccine at my AMC (role has shifted for a while to supporting a long term care facility / ICF for people with DD)- I'm waiting to receive a callback from the study coordinator by the end of the week unblinding me to which group I was in, but based on the timeline of symptoms I experienced for 1.5 days starting several hours after the second dose - combined with a negative COVID test the next day - I would be willing to bet a lot of money I got the vaccine. I had no reaction whatsoever after the 1st injection. About 8 hours after the second dose I developed a fever up to 101.8, a kind of qualitatively weird headache (like... pressure from the center of my brain pushing out and steady, not pulsing- different than a migraine) substantial fatigue for 1.5-2 days, and some lymph swelling on the side that I got the shot in. The study coordinator at the site who followed up with me (who was also blinded of course - it's double blind) stated that it seemed probable that it was the vaccine and if those were the side effects that was on par with the most severe they'd seen. And though not the best I've ever felt, it wasn't THAT bad. I called out 2 days of work and then was back to normal. They also hypothesized I might have had a greater reaction than most because I was part of a different vaccine trial last year (that also caused side effects for me) and my body's still sort of on "high alert." Maybe true, maybe not, but regardless, I would def do it all again. But would probably try to schedule the second dose for a day where I had a couple of days off coming up just in case.