I have accidentally given a piece of work that was copied and pasted from the internet to my teacher?

[*Kyle/Hazel*J N* ^_^]

I think I have accidentally given a piece of work that was copied and pasted to Microsoft word. What should I do? I did not intend to give this work to the teacher because I only copied and pasted it for information and to write it in my own words. The work is not mine!!!! Help me what should I do?? Will I get done for plagiarism?? How should I tell the teacher?? Panic mode!!!!
It WAS an accident because I did NOT intend to give it to my teacher in the first place and I know that I copied and pasted it for information ONLY. had I realised this I could of told my teacher!!
I have handed in my typed up piece along side it, by printing it out. (It was my own words) I think I printed the copied and pasted on too!!