I had two Pfizer vaccinations. No problems at all - except - as with the flu shot, I had problems with cellulitis because of swelling in my left arm. It was no big deal. My oncologist prescribed antibiotic and it cleared it up right away.

Yes i had my second shot on a week in between treatments. No issues or side effects

I had the Moderma shot while doing 6 treatments of chemo. My arm got heavy and a headache for a day or so. Not bad, with my all my doctors appointments that I can’t put off puts me into contact with people. Better than worrying about getting COVID-19.