About 10% of couples in the United States are infertile. Couples may be infertile if the woman has not been able to conceive after 6 to 12 months of having sex without the use of birth control.

If you and your partner are trying to have a child and you have not gotten pregnant, you may want to have an infertility evaluation.

Conception 
The process of becoming pregnant starts with ovulation, the release of an egg from a woman’s ovary. In an average 28-day menstrual cycle, ovulation occurs about 14 days after the first day of your last period. Once an egg is released, it can be fertilized for about 12–24 hours. Fertilization can occur if you have sex during or near the time you ovulate.