I have recently switched from Marvelon to Triquilar, and I asked my doc if I need a back up method as well! Here is the answer:
When finished your last pack of old pills, do not wait a week to have your period before beginning the new ones (Yasmin, in your case)!
So, take your last Ortho-Tricyclen or whatever and then start Yasmin the very next day. You might get some breakthrough bleeding since your body usually has a period at this time, but doc assured me that I am just as protected as always when switching!
Even if you waited to have that period, it'd just be like any other month, you're still fully protected!
Hope this helps!
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