I want to get on some form of BC...

So me and my partner had sex yesterday (it was unprotected which we both realized we should not do again) so i'm considering going on some sort of birth control method, or an IUD but i'm pretty uneducated in these stuff (sorry..) do i talk to my doctor? do i talk to a gyno? or do i just walk into the pharmacy asking for some sort of BC... i'm confused about these stuff. i'm in my 20s and never really got educated on sex ed