I have reviewed an essay i submitted and i have copied a sentence accidentally from a powerpoint slide. The genuine reason is that i listen to my lectures and have copied my notes from there into the essay (ones which are acceptable and put into my own words), but one of the things she said has also been on the powerpoint slide and i have not referenced her or the slide only the author of the actual idea. We are told to avoid citing lectures but i have accidentally copied this phrase that she has said.
Not going to make an excuse as i have clearly not reviewed my essay properly. My question is as i knowingly have plagiarised do wait till i get my essay back or do i go speak to my lecturer and admit it?