Court witness of a witness?

Basically i'm in a situation where a friend (lets call her Sarah) confided in me about her friend (also my friend but we're not as close, lets call her Megan) who had been having a sexual relationship with a teacher in our school. After a while I persuaded Sarah to tell a teacher about this. It eventually got taken into the hand of the police, I have recently given a statement about what I know although all I know is what Sarah has told me, Megan didn't even know that I knew, so it is basically second hand information. I've been told I could be called to court but it depends on whether the judges think my statement is worth it. What chances do you think there are that I will be called? And did I do the right thing in pushing Sarah in to telling someone? Also the teacher has pleaded not guilty which makes the situation even more complicated. Any advice wouldn't go amiss, thank you! :)