A final stage of self-checking should be checking your Turnitin submission before submitting your final document to your instructor.
When you submit your paper toTurnitin, a similarity report will be generated. This similarity report gives you feedback on what Turnitin has identified similarities or matches with another document in its database.
You can use this report to check your work and make sure you have not accidentally plagiarized.
This page gives you some information on how to interpret your similarity report.
This page gives information on how to view the breakdown on the matches discovered by Turnitin.
Be careful and don't panic: Sometimes Turnitin will flag headings, quotations and other words or phrases that you may have similar to other students.
This page explains how to exclude quotes on bibliography in your report. This can often lower your score.