1) Birth control pills prevent pregnancy through two various mechanisms

All birth control pills use hormones to stop pregnancy. Part contain a hormone called progestin. Rather contain 2 hormones, progestin and estrogen. Every one of them work-related by doing 2 things: They protect against women native ovulating, and also they cause the cervical mucus to thicken, which makes it more complicated for a sperm come penetrate and make contact with one egg if the woman is ovulating.

You are watching: Can birth control fail if taken correctly

In a way, birth control mimics the body"s solution to pregnancy. "There is some reality to the idea the birth regulate pills trick her body into thinking you"re pregnant," stated Dr. Vanessa Cullins, plan Parenthood"s vice president of outside medical affairs. "When you"re pregnant, you don"t ovulate, and also the cervical rubber is thickening to protect against anything from quickly getting right into your uterus."

2) lots of women take it birth control incorrectly

If females follow the specific instructions for acquisition birth regulate pills — every day, at the exact same time — they prevent pregnancy in 99 percent of all cases. Yet lots of civilization don"t do that. In real life, birth control pills have a 9 percent failure rate. That way nine of every 100 women using birth regulate pills as their only way of contraception come to be pregnant in any type of given year.

"It"s hard to in reality as soon as you"re life a liven life," Cullins says. "If you take these pills every single day, the chances of getting pregnant is 1 percent. But typically the chance is much higher than that, due to the fact that people miss out on pills. This isn"t just true through birth manage pills. It"s true with any type of prescription medication."

Birth regulate pills have actually a higher failure price than various other contraceptives, favor intra-uterine tools (IUDs) or birth manage rings.

*

The key difference: Pills need to be take away every day, i m sorry leaves an ext room for human being error.

3) There"s a three-hour home window for taking your birth control pill "on time"

I inquiry Cullins whether over there is wiggle room in terms of as soon as birth manage is effective. For instance, if a birth regulate user frequently takes a pill at 9 am yet one morning waits till 11 am, is she at greater risk because that pregnancy?

The price is no. Cullins said that because that those taking progestin-only pills, "on time" way taking the pill within the same three-hour window daily. A three-hour difference is not enough to lower the pill"s efficacy. "That"s acceptable," she said.

For mix progestin-estrogen pills, the an are is also wider. Females who miss one job of your pill have the right to take two pills the next day without reducing your birth control"s effectiveness. This chart v data from Planned Parenthood mirrors the organization"s referrals for how to manage a missed combination pill.

*

"Two or three missed pills is once you need to start to get concerned, and once you acquire to three missed pills, you need to think about emergency contraception and also using back-up birth control until she has actually finished the an initial week of the pills that the brand-new package the is begun after she bleed native emergency contraception," Cullins said.

4) absent a period on the pill doesn"t typical something"s wrong

Missing a period while top top the pill doesn"t indicate anything abnormal, Cullins said, as lengthy as you have been acquisition the pill consistently and correctly every day.

"It"s no dangerous no to have your duration while top top the pill," she says. "What wake up is, over time, the uterine lining can become very thin if you take it the pill regularly. Every that way is if you stop bleeding ~ above the pill, the lining has end up being so thin that you don"t have anything to bleed from."

This is no permanent: once a woman stops taking birth regulate pills, the ovaries begin making much more estrogen, the uterine lining gets thicker, and also women begin to bleed again.

Missed periods after taking your pills incorrectly, however, could indicate a pregnancy. In the situation, it"s worth acquisition a pregnancy test.

5) us don"t know whether many antibiotics do birth manage less effective

There are two antibiotics that researcher have uncovered make birth manage pills much less effective: griseofulvin, one antifungal provided to act athlete"s foot and also ringworm, and rifampicin, i m sorry is frequently used to treat tuberculosis.

The reason that wake up is that these drugs speed up the liver"s metabolism, which provides the liver metabolize the hormone in the birth manage faster. As a result, hormones leaving the blood stream faster and are unable to adequately impact the ovaries to protect against ovulation or the cervix to protect against thickening of the cervical mucus.

Lots of antibiotics, not simply the two detailed above, come through warnings the they"ll do birth control ineffective and suggest utilizing a backup an approach of contraception. When a backup an approach is never ever a negative idea, there"s actually sparse evidence that these various other drugs make birth manage less effective. "Uncertainty persists through respect to the various other broad-spectrum antibiotics," researchers in the journal Contraception composed in a review article about interactions in between birth control and antibiotics. They argue that in light of the uncertainty, the is completely appropriate for ladies to use a backup technique — yet not come ditch your antibiotics the end of concern over interactions.

6) Those "sugar pills" at the finish of a birth regulate pack? they have energetic ingredients.

Lots of birth regulate packs have four weeks of pills: three weeks that pills that stop pregnancy and also one mainly of pills that space inactive.

Women can safely skip that last week of pills and still prevent pregnancy, Cullins said. Yet that doesn"t typical the last week"s pills are just sugar pills. Together it turns out, few of them in reality have active ingredients to do the pills work much better or assist in women"s health.

"Some of the pills can have low-dose estrogen for 3 to four days, to assist prevent breakthrough bleeding ," she said. "Others periodically contain stole or folic mountain or various other vitamins. And also the hard part about omitted the pills is that you need to remember exactly when come start back up."

7) also under Obamacare, not everyone through insurance gets cost-free birth control

The variety of women getting cost-free birth manage pills has quadrupled under Obamacare, recent research shows. Two-thirds of ladies in a current Guttmacher Institute inspection reported paying zero dollars for their contraceptive.

*

But that still pipeline one-third of women paying something for birth control, even after Obamacare has mandated it it is in free.

The one-third of ladies still payment for your birth manage are most most likely in grandfathered health insurance plans. These are the plans that existed prior to Obamacare that do not need to comply through the contraceptives mandate (or most other Obamacare requirements, for the matter).

Grandfathered to plan are, however, disappearing. When a agency significantly alters its insurance allowance (drops a benefit, because that example, or transforms what enrollees have to pay), climate it loser its grandfathered status. Just over a quarter of health insurance to plan are at this time grandfathered, a number that has stability dropped because Obamacare passed.

See more: Bill Clinton Nuclear Deal With North Korea Failed, Why The Uss 1994 Deal With North Korea Failed

As that figure declines, the variety of women accessing no-cost contraceptives will certainly likely continue growing.