First of all the pill can make you bleed and seriously hurt yourself. They are not to be used for abortion and if you are 3 weeks pregnant (which can also be 5 weeks since you have to add 2 weeks before there was possible to see that you were pregnant in the first place) I don't see why you would take medicine to get your period. They are not used for abortion because they are not reliable and can make you bleed to death.
Since the pill forces the uterus to contract and shed the lining the injuries to the embryo if it survives can be any injuries like deformation since you will disrupt it's development.
So if you want to abort, go to a clinic and use the abortion pill.
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