Surprise Pregnancy

Twilight finds out she pregnant, and has a pretty good idea who the father is but won't tell anyone. Why?

Twilight is pregnant and everyone is so excited for her, though no one knows who the father is, or when they meet. Twilight's friends know that she wishes that the father was part of her life but can't and it's up to this good friends to find out why.

Horn's and wing's, Twilicorn and a place (no the friendship place)