You can start taking Hana at any point in your menstrual cycle, and when you start taking it will not change how effective it is. However, you may not be protected straight away if you take it at certain times in your cycle.
If you want to be protected from pregnancy straight away, you should start taking Hana in the first 5 days of your menstrual cycle. If you take it after the first 5 days of your cycle you won’t be protected immediately, and you will have to use additional protection, such as condoms, for the next 2 days.
You should start taking Hana the same day the ring, coil or patch is removed then you do not need to use another form of contraception.