If you have been on hormonal contraceptive pills , then it loses its effect in 48 hrs.
If you have been on depot injection or progesterone IUD, then the effect may take whole 1 month after the last missed dose or removal.
If its a plain copper IUD, then fertility is regained in the same cycle.
In cases on implants, it takes a month for cycles to regularize.
I hope i have answered your query,
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