<unk>  <unk>  is a birth control measure, used after sexual intercourse to prevent pregnancy. There are different forms of<unk> .<unk>  contraceptive pills <unk> Ps), sometimes simply referred to as<unk>  contraceptives <unk> s), or the morning-after pill, are medications intended to disrupt or delay ovulation or fertilization, which are necessary for pregnancy.Copper-releasing IUCsWhen used as a regular or<unk>  method of<unk> , copper-releasing IUCs act primarily to prevent fertilization.<unk>  insertion of a copper IUC is significantly more effective than the use of<unk> Ps, reducing the risk of pregnancy following unprotected intercourse by more than 99%.2,3 This very high level of effectiveness implies that<unk>  insertion of a copper IUC must prevent some pregnancies after fertilization.Emergency contraceptive pillsTo make an informed choice, women must know that<unk> Ps—like the birth control pill, patch, ring, shot, and implant,76 and even like breastfeeding77—prevent pregnancy primarily by delaying or inhibiting ovulation and inhibiting fertilization, but may at times inhibit implantation of a fertilized egg in the endometrium. However, women should also be informed that the best available evidence indicates that<unk> Ps prevent pregnancy by mechanisms that do not involve interference with post-fertilization events.ECPs do not cause abortion78 or harm an established pregnancy. Pregnancy begins with implantation according to medical authorities such as the US FDA, the National Institutes of Health79 and the American College of Obstetricians and Gynecologists (ACOG).80Ulipristal acetate (UPA). One study has demonstrated that UP can delay ovulation.81... Another study found that UPA altered the endometrium, but whether this change would inhibit implantation is unknown.82p. 122:Progestin-only<unk>  contraceptive pills. Early treatment with<unk> Ps containing only the progestin levonorgestrel has been show to impair the ovulatory process and luteal function.83–87p. 123:Combined<unk>  contraceptive pills. Several clinical studies have shown that combined<unk> Ps containing ethinylestradiol and levonorgestrel can inhibit or delay ovulation.107–110 Intrauterine devices (IUDs)usually used as a primary contraceptive methodare sometimes used as the most effective form of<unk> . However, the use of IUDs for<unk>  is relatively rare.
Emergency contraception
Heat-based contraception
Long-acting reversible contraception
Male contraceptive
Menstrual extraction
Combined oral contraceptive pill
Combined hormonal contraception
Extended cycle combined hormonal contraceptive