I agree as a couple we would also feel the need to abstain.
For me it would be a moral issue but even if it were not simply because of the contraceptive effect, isn’t there a chance of the Pill leading to the abortion of a fertilised embryo ?
It’s possible, but unlikely.
In the case of using hormonal contraception to deal with a medical problem such as endometriosis, the contraceptive and potentially abortifacient effects are considered unintended consequences from a moral perspective.
Morally, it’s like an operation to remove a baby who’s implanted in the mom’s fallopian tube instead of her uterus. The baby can’t survive while implanted there, and when the baby grows big enough, the tube will rupture, causing mom to bleed out and potentially go septic, both of which would kill her. Therefore, it’s morally licit to remove the baby, even though doing so will kill the baby, in order to save the mother’s life, because the intent in doing so is to save the mother’s life and not to kill the baby. (Hopefully, of course, technology and medical science will someday advance to the point where a baby implanted in the wrong place can be put into mom’s uterus and continue to develop, but we’re not there yet.)
In short, it’s morally acceptable (per
Humanae Vitae as quoted above) to continue having sex while on the pill for medical reasons like endometriosis, but that also doesn’t mean that you
have to; I suspect that DH and I wouldn’t be okay with the possible consequences either if we faced a similar situation.