Furthermore, penicillin is only suggested for group A strep, which has already been declining in effectiveness since the 80s. It also shouldn't be given simply as a precaution until you know what bacteria you're dealing with. It was probably already a resistant strain of strep, but the way the following doctor explained it to me was that by introducing the penicillin, it made it more resistant to other antibiotics that I should've taken instead. The only course of action I had was to wait it out. She said she could have tried other antiobiotics, but there was no way to tell if it would work. Luckily, I was already recovering by the time we got the results back for strep throat.
P.S. The person I contracted the strep throat from was fine after about a week of clindamycin.
EDIT: I’m no doctor myself. I’m just going based on what I was told. If the second doctor gave me bad information, then I’ll be happy to assume that both were shitty doctors. That wasn’t the only time I had horrible experiences with that clinic (completely forgot to document multiple doctor’s visits and weeks of PT I had in relation to a sports injury and I lost my redshirt eligibility as a result as there was no proof of the injury). That clinic was the only option I had with student-athlete health insurance. But, I’m not changing my mind on the first doctor after everything else, regardless of the penicillin.