Does d. gray man end at episode 103 or is it ongoing because the millennium earl is still alive and so is the noah and they are still planing to kill Allen if i got it wrong don b mean?

The manga D.Grayman continues beyond the anime's end at 103.

The Noahs are still alive.

Lenalee just got her powers and we now see the evolution of Innocence in two characters.

There is still much mystery surrounding the powers of the 14th musician.

You can catch up on the story here:

http://www.onemanga.com/D.Gray-Man/