Women are capable of conceiving before they enter their menopause. Thus, since the time they become fertile, until the time their organism stops producing new eggs, they should be capable of having children. However, there are times of the menstrual cycle when women are more fertile that at some other times.
Thus, through careful calculations and good organization in terms of family planning and following one's biological clock, every fertile woman can get pregnant more easily.
Menstrual Cycle and Fertility
Basically, about 30% of all women have their fertile period between the 10th and the 17th day of their menstrual cycle, according to the researchers who work at the National Institute of Environmental Health Sciences. The researches which proved this were conducted on women aging from 25 to 35, being in their prime age for getting pregnant. Teenagers and women approaching menopause are not considered to be as reliable, in terms of their fertile and infertile days of the menstrual cycles.
However, biology of women does not follow this specific pattern in all cases and women who use calculations of their fertile and infertile days as a birth control method should rather opt for some other means of contraception since they can easily become pregnant even if this is supposed to be impossible.
Simply, health experts recommend that couples who desire to get pregnant should not worry about the fertility in the menstrual cycles of the women. Rather, they should simply engage in unprotected sex for about 3 times a week, until the signs of pregnancy occur.
Furthermore, some researches have shown that about 70% of the women undergoing testing were fertile even before they reached the 10th day of their menstrual cycle. What is more, their fertile window was opened as soon as on the fourth day of this cycle.
However, in some other cases, women who have regular and precise menstrual cycles were found to have 1 to 6% chances of getting pregnant on their infertile days, even on the day when their menstrual cycle is about to begin.
The same way, having sex on fertile days of the menstrual cycle does not guarantee that a woman will become pregnant. We need to take the condition of the partner's sperm into consideration, along with many other factors such as the condition of the egg, the receptivity of the uterus etc.
An interesting piece of data on this whole matter lies in the report of a doctor who worked during the WWI. Namely, this German physician reported that about 25 pregnancies took place from a single sexual intercourse, during the soldiers' leaves home, taking place between the day 2 and day 30 of the menstrual cycles of their partners. Today, about 8 decades later, the chances of women getting pregnant during various stages of their menstrual cycle are almost the same, being more or less random.
Fertility before Menopause
Many women, men and experts in the field of health claim that the fertile age of every woman ends with her menopause. Simply, they say that a woman cannot possibly get pregnant once her menstrual periods stop occurring. In most cases, all these individuals are absolutely right.
However, we need to bear in mind that menopause is a gradual process which does not make women infertile overnight. Rather, there are stages to this point of female existence and fertility. Therefore, being in menopause and going through the process of menopause are not the same notions.
In fact, perimenopause, the transitional period between the end of menstrual cycles and the onset of menopause can last for more than 6 years. Usually, this period appears after the year of 40, starting with the transition, lasting until the age of 50, when real menopause commonly takes place. So, simply enough, real menopause makes it impossible for you to get pregnant. Nevertheless, all the transitional stages which appear prior to this stage leave small chances of pregnancy existent.
Bear in mind that women are most fertile during the 20s, until the mid 30s. By the end of their 30s, the fertility of women decreases significantly, getting gradually less as the years go by, commonly disappearing completely after the age of 51. Biology functions this way, since women are born with about 2 million eggs at their disposal, only 100 of these remaining during the last stages of their menstrual cycles. Regardless, even these last eggs can result in pregnancy, be it planned or unwanted, if adequate contraception methods are not used.
All in all, fertility decreases with age. However, the menstrual cycle of many women cannot be trusted enough to serve as a method of birth control. So, rest assured that, even when you reach the end of your menstrual cycles, approaching the 5th decade of your life, there are still chances of conceiving. Thus, if you do not desire this, be careful.