The way we take the pill has more to do with religion than science. Having a monthly "period" while on the pill is far from necessary.

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A pill a day.
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▼ The way women have been advised to take the combined contraceptive pill for the last 60 years unnecessarily increases the likelihood of taking it incorrectly, leaving them at risk from unplanned pregnancy. And this far from ideal situation is the result of a cosmetic quirk of pill design, based on long redundant historical context.
This is because standard combined oral contraceptive pills—such as Loestrin, Ortho Tri-Cyclen, or Yasmin—are designed to be taken for 21 days, followed by a seven-day break, during which time the woman doesn’t take the pill and experiences vaginal bleeding. Pill-taking women therefore have what seems like a “period” every month.
But this “period” is far from necessary. Shortly before his death in 2015 I attended a lecture given by Carl Djerassi, the “father of the pill”. He remarked that the seven-day break, and resultant withdrawal bleed, was designed into the pill in the late 1950s in an attempt to persuade the Vatican to accept the new form of contraception, as an extension of the natural menstrual cycle. As is well known, this did not succeed: Pope Paul VIforbade artificial contraception. Despite this, the seven-day break has remained as a component of the combined oral contraceptive pill.
This is a problem. The seven-day break is a hazardthat may increase the risk of pregnancy while taking the pill. This is because the level of contraceptive hormones in the body is the crucial factor in turning off ovulation, without which pregnancy cannot occur. It takes approximately seven daily doses of contraceptive pill to reach sufficient levels to turn the ovaries off. But the seven-day break allows these levels to fall again. If pill-taking is not resumed by the ninth day after stopping, ovulation will occur.
Missing an occasional pill is unlikely to cause hormone levels to drop to a level which would risk ovulation. But taking a deliberate seven-day break lowers hormone levels to a point after which further missed pills, either before or after the break, may allow ovulation to happen.

Some brands, such as this one, have placebo pills rather than a pill-free break.
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The seven-day break is therefore an inbuilt hazard.  (▪ ▪ ▪)

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