This is normally when your valves need a clean. Sometimes, no matter how much you oil your valves, they will continue to be spongey or stick. I recommend watching the video clip below. Carefully take your time and make sure the valve cap is on straight. On some trumpets, the valves can lock in back to front.
If the trumpet is blocked, double check that the valve can't turn around and that the number on the valve is facing the mouthpiece. Before you screw the cap back on, blow through the trumpet to check that the air can still flow through it.The number on the valve, which you can't see now, will be facing the mouthpiece.
With the number facing towards you (as in the picture above), push the valve back into its casing and then turn the valve a quarter of a turn clockwise until it clicks and locks in.Valve one is nearest to the mouthpiece and valve three is nearest to the bell. Make sure that the correct valve is in its right slot. As you can see in the picture, each valve has a number stamped on it. Putting the valve back is the trickier bit.
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