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Human reproduction is an inefficient process. During the first year, the probability of pregnancy for a couple, only 20% per month. This means that if this month, one hundred couples seeking pregnancy only twenty would block them. The other eighty will have to try the following month. So a couple who take only one, two or three months trying to get pregnant without success, do not think he has a problem.
Then: How long to wait?
Although the probability of pregnancy per month is low, the probability of pregnancy in the long run is good. If the same hundred couples seeking pregnancy, persist in their search for a year, at the end of this year, will have been pregnant at least eighty. For twenty couples that after a year of searching have failed to become pregnant, the picture is not so good. For them, the pregnancy rate per month for the second year is 5%. At this time these couples should seek professional help.
Recommendation: If after having sex for a year, without using any birth control method, it has not achieved a pregnancy, you should consult a fertility specialist.
An exception to this recommendation are older couples. Over the years, fertility begins to decline. This is true both for men and for women. Unfortunately, it occurs more rapidly for women than for men. In women, after 35 years begins to be noticeable decline in fertility and 39 years after the process is accelerated. In man there is a process similar to but more advanced age.
For couples where the woman is over 35 or men over 55 years, the recommendation is to look after 6 months of fruitless searching of gestation.
This answer was provided by inSer - Human IVF and Fertility Center