Lied to abt birth control

Um. Had my first gynecologist appointment recently and told her what I was all taking medication wise, including progesterone (specific formulation as medroxyprogesterone but was taking norethindrone in the beginning) and she told me that progesterone is not effective birth control. My endocrinologist on the other hand, when I asked however long ago, said that it was 99% effective as birth control. So either someone isn’t telling the truth or I somehow managed to miscommunicate with one of my practitioners. Still recovering bc I have been creampied plenty of times and I COULD HAVE GOTTEN PREGNANT???? YOU’RE TELLING ME I COULD HAVE GOTTEN KNOCKED UP??? Oh my god. Not an issue now bc I’m in a committed relationship with another trans guy but jfc. Anyways does anyone have any clarification on this? My gyno seemed to be pushing an IUD really hard despite me saying I don’t think that’s a good fit for me.

Edit: I take the progesterone orally for those who asked, and thank you guys for the clarification! Still reeling 😭

Edit 2: Thank you to everyone who has shared their own experiences!! I was a little mortified to see that my pregnancy panic got this popular. I used condoms 85% of the time for those concerned because I know that no birth control is 100% effective. I was just mortified to know the 15% of time I was relying on oral BC were a lot riskier than the risk I already know what involved. Anyways sending anti-pregnancy vibes to all those trying to avoid pregnancy 🙏🏻