It is not the same as sterility because an infertile person may have no physical disorder of the reproductive system.
Many couples are temporarily infertile.
The likelihood of becoming pregnant on any one occasion is only about 1 percent. Nearly 90 percent may be pregnant within 1 year, the remainder within 2 years. Older women usually take longer. During this time they can work out the exact ovulation day of the woman. To do this, the woman takes her temperature the first thing in the morning, before having anything to eat or drink.