Are you kidding me? That was some pretty BAD advice. I know this is an old post but geez. Doctors are used to that kind of stuff and not telling them and making them guess can make it harder for them to figure out what's wrong. If you are too embarrassed to talk about it then you're probably not old enough to be doing it
You might have had infection before your bf fingering you, that's why you felt hurt when he did this. I dont think you should tell your doc about this, kind of embarasing. Just let him check and see what is the result. Good luck