i am getting only 2 endings

Is that 5000 before or after the multiplayer percentage?  (Example: 5000 points in War Assets but at 50% Galactic Readiness = 2500 points total, below the 2800-point minimum for the third ending.)  If not, you'll need to play a little multiplayer (2 rounds should do it) to get your Galactic Readiness up to at least 56%, which will get you past the 2800-point minimum total.