2nd month on yasmin, had period last week, lighter than period on diane35. experiencing pms symptoms and spotting 4 days after period ended. pregnant?

Take a test: If you think you might be pregnant check then check a home pregnancy test. They are cheap, reliable and available at any pharmacy. This is the same way a doctor would test you for pregnancy. Lighter periods on Yasmin are one of the nice side effects of this pill

Do a PG test: It is unlikely that you are pregnant but you can perform a pregnancy test and remove any doubt.