25.03.2015

Times you cannot get pregnant

Given the MFR, the probability of getting pregnant after a given number of months can be calculated with a negative binomial distribution.
So almost half of the (healthy) 25 year olds get pregnant in the first monthtwo months, and after two years (the point when doctors start considering you to have fertility problems) more than 90% of 35 year olds should conceive.
Of course, from a male point of view, conception is an embarrassingly parallel problem: you can dramatically reduce the time to conceive a child by sleeping with lots of women at once. This is the argument I used with my husband to get him to start trying immediately (i was 36 at the time and i told him it would take at LEAST a year to get pregnant). You should take into account that woman get older during next attempts to become pregnant, so MFR will decrease. This analysis seems generally optimistic, especially because most of the age groups show a 100% of getting pregnant eventually. Like I said in the text, health problems mean that you need to reduce the monthly fecundity rate.
Even if you don’t consider this extreme case where MFR=0, this uncertainty on the MFR clearly has a strong influence on the curve and on how to interpret it.
On your curve, with MFR=0.05, a woman has 85% chance to be pregnant after 3 years and 95% after 5 years.
Another confusing issue is how to handle subjects who become pregnant multiple times in the data.


My point is that your model is very far away from reality (the real curves would not look at all like that, it would be way flatter after one year) because you take MCR as an input, whereas your only input is the age, from which you make an initial estimation of MCR. The first month, your estimate your MCR from the only information you have: the age, which is what you did. Yeah, the graph was drawn as though you start trying around ovulation time, so the first month is month zero. An MFR of 0.25 means that one quarter of 25-year olds will get pregnant in the first month. On a more practical note, my wife got pregnant within two cycles of starting to use an electronic ovulation tester. Not doubting you, just curious to read more about it [child health researcher of prime reproductive age]. In the case of extreme infertility problems (for example, you’ve had a hysterectomy and thus have no womb), the MFR is zero, and the chance is getting pregnant is zero over any time period. Some constant fraction of the population who are trying to conceive are sterile, so you can make a vastly more accurate model by assuming that you start with e.g. And then there’s the fact that fecundity rate changes, not least because baby-making intercourse becomes a real drag, so happens less over time. Depending on the kind of birth control you were using before you ditched it and started trying to conceive, the rate your cycle regulates may vary, but not by much.


So you have to take into account that there is a probability that your MFR is 0 (not necessarily with medical evidence).
This suggests that by 12 months, 90% of those who will ever get pregnant naturally, already have.
However, it becomes possible to statistically assign couples to one of these groups based on time trying and a little bit of medical history, and then provide a much more realistic assessment of the chances of natural pregnancy. In a 1982 study, it was considered a potential fertility booster for its ability to thin cervical mucus (in the same way it thins the mucus in your nasal passages), thereby allowing easier travel for sperm to get to your eggs.
But considering that no studies have proven this to be true (and the fact that swallowing cough syrup also means you may be taking in other not-so-good things for your fertility like antihistamines), we say next time you hear this wacky piece of advice, just laugh it off. In fact, studies show that within one year after stopping the Pill, 80 percent of women who want to get pregnant do. So if you really want to ensure more time between babies, take it from us and get back on your B.C. You two will be at it a lot these days anyway, so there will be plenty of chances to run the gamut when it comes to trying out new positions and bringing back old favorites.



Getting pregnant lubricant
Movie about pregnant women


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