I am glad you reached out with these questions. We are not medical professionals and cannot directly advise you on the likelihood of transmission in this particular case, but I can give you some information that may be useful in easing your mind. It sounds like you had sex with someone and did not know their status and are unsure about how effective the protection you used was.
If you are concerned, testing can certainly give you a more concrete answer and peace of mind. Tests typically have a window period of more than 12 days since possible exposure. You can find more info on that and other types of tests here: https://h-i-v.net/test-types.
Please keep us posted on how you are doing, and I hope this information can help you.
Best,
Liz (Team Member)