Congratulations on getting your first dose! I got my first dose of Pfizer a few weeks ago and I regret not getting AZ. I was torn between the 2 vaccines but opted for Pfizer because the gap between doses is shorter. But, with NSW extending the gap to get more first doses into people, I only saved myself a couple of days AND I had to go to a mass vaccination site where I spent a lot of my 2.5hr wait in crowded, poorly ventilated indoor areas.

All this to say that you almost definitely did yourself a huge favour by going this route. The protection offered by different COVID vaccines appears to be pretty much a wash unless a doctor says you need something specific. Also, when checking my vaccination history, I noticed that every single one of my flu shots was a different brand -- so ridiculous that we've turned vaccination into some sort of weird exercise in brand loyalty.