You can't be certain because of how much misinformation is floating out there right now. The best thing you can do is disregard the scaremongering and just take care of your own health. If you feel the vax won't help you then don't get it or if you feel your immunity can't take care of it then don't. If you live with or are immunocompromised people, then it may not hurt to get it.
https://www.cslbehring.com/vita/2021/donating-plasma-after-covid19-vaccination
They changed their mind they can know.
You can't be certain because of how much misinformation is floating out there right now. The best thing you can do is disregard the scaremongering and just take care of your own health. If you feel the vax won't help you then don't get it or if you feel your immunity can't take care of it then don't. If you live with or are immunocompromised people, then it may not hurt to get it.