Question

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Hormonal contraceptives can be cyclic or non-cyclic. Non-cyclic hormonal contraceptives provide a constant level of hormones everyday for months or years. Examples of non-cyclic hormonal contraceptives include the hormonal IUD (Mirena), the hormonal implant (Norplant or Implanon), and the hormonal injection (Depo-Provera). Cyclic contraceptives provide hormones for about 3 weeks, then one week of no hormones. Examples of these include various types of birth control pills and the vag ring (NuvaRing, which is kept in for 3 weeks then removed for one week.)

Many females using hormonal contraceptives in general tend to have lighter and shorter menstrual periods after a few months, but those using non-cyclic methods often do not have any menstruation at all. Why might this be? Write a paragraph describing a potential mechanism.