20.11.2014

What are your chances of getting pregnant using a condom and birth control

It's one of those things that makes sense if you stop and think about it, but a series of interactive charts by Gregor Aisch and Bill Marsh in last weekend's New York Times really helps put it in perspective.
Perfect use: A measure of the technical effectiveness of each method, but only when used exactly as specified and consistently followed. Assuming typical male condom use by a heterosexual couple, the number of women projected to experience an unplanned pregnancy over a period of ten years is about 86 out of 100. For male condoms used on a ten-year timeline, the difference between pregnancy rates during perfect use (18%) and typical use (86%) is almost 70%. Used correctly and consistently, these contraceptive methods are projected to result in an unplanned pregnancy in just 3% of women over a ten year period.
Over the same time period, that's lower than the projected rate of unplanned pregnancy in women who have been sterilized.
Number 2 is that Trussell's original figures are estimates, made based on data collected from large populations. Number 3 is that these estimates have been corrected for underreporting of abortion and over-reporting of contraceptive use, both of which occur, and neither of which is very well understood.
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All reversible birth control methods will help prevent pregnancy while you’re using them, but none have long-lasting effects on your ability to get pregnant when you stop. Let’s look, for example, at how long it takes for women to get pregnant when they quit the Pill compared to when they quit non-hormonal fertility awareness methods (FAM, sometimes called natural family planning).
If you had sex with a new partner and didn’t use a condom, you can still protect yourself by getting tested. Tina Raine-Bennett, MD, MPH, is a Professor in the Department of Obstetrics & Gynecology at the University of California, San Francisco, and Medical Director of the New Generation Health Center.


The prescription will run out on your birth control and you'll miss a couple of days, lowering your body's guard against unwanted pregnancy. Few couples, if any, achieve flawless contraceptive use, especially over long time periods.
We forget, misremember, and misuse, and so we see a projected rate of pregnancy (again, over 10 years) of not 3%, but 61%. Probabilities of pregnancy for most of the reviewed contraceptive methods were estimated based on data collected in the 1995 and 2002 National Surveys of Family Growth (NSFG), a nationally representative sample of users. These numbers can't tell you with any certainty what your likelihood of an unwanted pregnancy is, because the only person who can say how consistent you are with your chosen method of birth control is you. Pregnancy rates based on the NSFG alone would tend to be too low because induced abortions (and contraceptive failures leading to induced abortions) are underreported but would tend to be too high because contraceptive failures leading to live births are overreported. In the NSFG and in most clinical trials, a woman is 'using' a contraceptive method if she considers herself to be using that method. That’s why women who use the Pill but accidentally forget to take it for a few days can get pregnant that month. A big study of over 2,000 women who quit the Pill after using it for an average of seven years found that 21% were pregnant in one month and 79% were pregnant in a year. Luckily, getting tested for Chlamydia or Gonorrhea is easy and painless: you just pee in a cup.
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With the exception of the ovulation method (perfect use 26%, typical use 94%), that's a bigger difference than any other contraceptive method.
Unintended pregnancy rates of other methods were based on surveys and clinical investigations.
So, typical use of the condom could include actually using a condom only occasionally, and a woman could report that she is 'using' the pill even though her supplies ran out several months ago.
Women who stopped using FAM had very similar rates of pregnancy, with 20-25% pregnant in one month and 80% pregnant in a year.


For some women who stop using the implant or the shot (Depo-Provera), it can take a few extra months to start normal menstrual cycles again.
You load one bullet into the cylinder, give it a spin, snap it in place and pull the trigger. In other words: The longer you use a given contraceptive, the more opportunities there are for you to use it improperly or inconsistently.
The reason is that the least adherent users become pregnant, leaving behind a group that over time is less and less likely to fail.
In other words, women who quit the Pill get pregnant just as fast as other women, even if they’ve used the Pill for years. There may be a delay of up to two months after stopping the implant and up to six months after stopping the shot, but this varies from person to person, and most women get pregnant soon after stopping these methods. If you test positive, you can tell a partner he or she should get tested and treated using an anonymous e-card. But we must ask that you cite your source if you want to challenge any scientific or technical information on Bedsider. The longer a woman has an untreated STI like Chlamydia or Gonorrhea, the higher the chance that it will cause scarring in the tubes that connect her ovaries and uterus. And for future hookups, you can learn more about talking to a new partner about using condoms.
And please note: We will not tolerate abusive comments, racism, personal attacks, or bullying. And if you have an urgent medical question, please contact your doctor or a local health center. That scarring makes it difficult for an egg to travel the right direction, and hurts her chances of getting pregnant in the future.



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