There are people who think that the only reason why pregnancy is not achieved is the woman's age and gynecological problems. However, this is not so.
About 30% of the causes of infertility are female, but the same percentage is also due to male problems. In addition, 20% of infertility cases are caused by both female and male alterations, i.e., it is a mixed cause.
The remaining 20% is sterility of unknown origin. In these cases, all tests and fertility studies are correct, but pregnancy is not achieved naturally.