[Xineas]

The doctor will most likely ask you, yes, but as far as I know, doctor-patient appointments are confidential and doctors may only share the information with certain people if you give permission.

I doubt they will check, if I'm right they only check if there's something wrong down there, not just because you've said you're sexually active.

But I'm not a girl, so don't pin me down on it...

Also, if you're afraid your mom will find out, you can always choose to tell your mom beforehand. Sure she won't like it at first, but talk about it with her, explain your side of the story and listen to her side. If you do choose to do so, don't act like it's nothing, be really serious and don't smile. If you show her you're mature enough, she'll react much more positive than when you're acting like it's nothing to lose your V.

No matter what you do, good luck!