soon

Something that happens soon happens shortly after another time, often shortly after the time of speaking.

Example: Why did he call me so soon? Did something bad happen?

If x happens as soon as y does, x happens right after y.

Example: As soon as he finished eating, he got up and walked away from the table.

If something is soon, it is shortly after another time, often shortly after the time of speaking.

Example: He wanted to leave, but it seemed too soon.