No one is arguing that "If she stops using hormonal contraception properly without telling her DP/DH then she is deceiving him." We all agree with it
"If a woman truly accidentally fell pregnant whilst using contraception (which is rare if she was using it correctly) then that’s different."
Yes - its rare, but your tone implies that most of the 'rare' accidents are not accidents
https://www.nhs.uk/conditions/contraception/how-effective-contraception/
Rersible contraceptive (LARC) methods
You do not have to remember to take or use these methods. They have no user failure, so are not less effective with typical use.
Contraceptive implant: more than 99% effective with perfect use. They work for 3 years, but can be taken out earlier. Fewer than 1 in 100 women using the implant will get pregnant in a year.
Intrauterine system (IUS): more than 99% effective. An IUS normally works for 3 to 5 years depending on the type, but can be taken out earlier. Fewer than 1 in 100 women will get pregnant over the 3 to 5 years when using an IUS.
Intrauterine device (IUD): more than 99% effective. An IUD can stay in place for 5 or 10 years depending on the type but can be taken out at any time. Fewer than 1 in 100 women will get pregnant in a year, depending on the type of IUD. Older types are less effective.Contraceptive injection
Contraceptive injection
Perfect use: more than 99% effective. Fewer than 1 in 100 women will get pregnant in a year when using contraceptive injections regularly.
Typical use: around 94% effective. Around 6 in 100 women will get pregnant in a year.
The injection lasts for 8 or 13 weeks, depending on the type.Patch and ring
Contraceptive patch
Perfect use: more than 99% effective. Fewer than 1 in 100 women will get pregnant in a year when using the contraceptive patch correctly.
Typical use: around 91% effective. Around 9 in 100 women who use the patch will get pregnant in a year.
Vaginal ring
Perfect use: more than 99% effective. Fewer than 1 in 100 women will get pregnant in a year when using the vaginal ring correctly.
Typical use: around 91% effective. Around 9 in 100 women using the ring will get pregnant in a year.Contraceptive pill
Combined contraceptive pill
Perfect use: more than 99% effective. Fewer than 1 in 100 women will get pregnant in a year when using the combined pill correctly.
Typical use: around 91% effective. Around 9 in 100 women using the combined pill will get pregnant in a year.
Progestogen-only pill
Perfect use: 99% effective. Around 1 in 100 women will get pregnant in a year when using the progestogen-only pill correctly.
Typical use: around 91% effective. Around 9 in 100 women will get pregnant in a year.Sterilisation (permanent contraception)
Female sterilisation: more than 99% effective. Around 1 in 200 women will become pregnant in their lifetime after being sterilised.
Male sterilisation or vasectomy: around 1 in 2,000 men can become fertile again in their lifetime after a vasectomy.Male and female condoms
Male condoms
Perfect use: 98% effective. This means that 2 in 100 women whose partners use a condom will get pregnant in a year.
Typical use: around 82% effective. This means around 18 in 100 women will get pregnant in a year.
Female condoms
Perfect use: 95% effective. About 5 in 100 women who use a female condom will get pregnant in a year.
Typical use: around 79% effective. Around 21 in 100 women will get pregnant in a year.Diaphragms and caps
Diaphragms and caps
Perfect use: 92 to 96% effective. Between 4 and 8 women in 100 who use a diaphragm or cap with spermicide will get pregnant in a year.
Typical use: around 71 to 88% effective. Between 12 and 29 women in 100 using a diaphragm or cap will get pregnant in a year.Natural family planning
Natural family planning
Perfect use: can be up to 99% effective if the natural family planning methods are followed precisely. These include monitoring cervical secretions and your basal body temperature. It's more effective if more than 1 method is used and it's taught by specialist teachers. Up to 1 in 100 women will get pregnant in a year when using this method perfectly.
Typical use: around 76% effective. Around 24 in 100 women using natural family planning will get pregnant in a year.Page last reviewed: 17 April 2020