you got the first of each one but not the second of either.
play yourself, brehs...
That's not how that works at all.
They basically have the same shyt, and its completely fine to mix and match. Ie Pfizer then moderna or moderna then Pfizer.
The person administering the shot should be educating you on any side effects, when and how to follow up. If you've gotten the jab and they didn't tell you that you can mix and match, what side effects to look out for, how soon you need the second dose and when the vaccine is fully active then you have every right to be skeptical.