They are both progestins, they do the same thing, have the same hormonal effect on the body, just in different forumulations, (if I'm not mistaken)
As long as you follow the instructions seamlessly from the leaflet contained with your
birth control/doctors advice, the changeover of pills will be completely safe.
You may notice side effects when switching pills, and your withdrawal bleed might slightly change, as to be expected when starting a new pill. So don't worry.
Example: When I switched pills I noticed a little
nausea for the first week, (although it was nothing compared to the side effects I had when actually starting birth control for the first time) and my withdrawal bleed came one day earlier than it used to after stopping the active pills.
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