I think now I can finally write this in public: I didn't take COVID vaccine at all, because for coincidental reasons, my dad ended taking it first. Despite the fact he is already 50+ he had really severe, but thankfully mostly temporary cardiac side effects (mostly, because even months later he needed to go to his cardiologist and change his cardiac-related medicine, because since the vaccine his blood levels changed and he kept having weird symptoms).

Since my dad had his health go so poorly after the vaccine, I decided to not risk it, specially considering my existing conditions.