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Hi Dr. Mo here, please give me a moment to reply.
That's a low dose hormone so it is quite possible to have either break through bleeding or a full period on that medicine.
4 weeks isn't really long enough to get accustomed to a new birth control.
We always recommend 2-3 cycles. But yes, it is quite normal to still not have a period with it.
Of course you should do a pregnancy test but I'm sure you would know.
So in order to investigate why you aren't having a period your doctor can run a few tests, but even not having a period doesn't mean that anything is wrong with your reproductive organs.
Just as much as the medicine can give you spotting and breakthrough bleeding it can completely get rid of your period.