If you are on your period, do you have to get naked at checkups?

I have gone with my friends to their checkups before and i always get kicked out of the room, and i started to wonder why. Then I heard from some ppl that if you are on period then you have to get naked at checkups. Mine is coming up and i'm kinda freaked out. I HAVE A MALE DOCTOR!!! I am scared, can u help? no haters please...