Don't sweat it. Just make sure you and your CFI go over the questions you missed. Here's a link to the PDF you can use to look up the questions on the test. Use the "Find" command and type in the PLT codes that are listed on your test report.
http://www.faa.gov/education_researc.../media/pvt.pdf
Unfortunately, some PLT subject codes might have 10 questions or more associated with them. In that case, you have to look at each one until you find a question that you remember seeing on the test.
Best of luck on your checkride!
- Jeff