Conversation: The conversation between human and AI assistant.
[|Human|] I need to switch from cerazette to yasmin but I m a week into my cerazette pack. Do I have to wait until I finish this pack before I start the yasmin, or can I start it now (since I ve been bleeding the past couple of days, so I guess I m on my period?)?
[|AI|]  Hi, Yes, you have to finish your cigarette pill completely first. If you wish to switch from cigarette to Yasmin, finish your entire pack of cigarette (including the placebo pills). Then, when you come to what would have been week one, day one of your old pill, start your new pill pack of Yasmin thereafter. If you do this, you are protected against pregnancy straightway and do not need to use a backup birth control method. Hope I have answered your question. Let me know if I can assist you further.