Should I tell my teacher?

I did a project with three other girls, and then was away for a day. When i cam back, they'd decided they'd present and i could just hold up the posters! I did the entire project, and the ONLY thing they did was underline a few headings. My teacher doesn't think i did anything at all! I have some of the rough work...they have the rest. i can get it back though from them. Should I rat them out, and possibly have them hate me (they already do anyway) and get a great mark, or should I let it be, and settle for a failure to make them happy? HELP!! I'm not sure what to do! Save face or not??