Fertility Glossary

Fertile window

The few days each cycle when sex can lead to pregnancy.

The fertile window spans roughly the five days before ovulation and the day of ovulation, because sperm can survive several days in the reproductive tract while an egg survives about a day.

Related terms

Ovulation

The release of a mature egg from an ovary.

Menstrual cycle

The monthly hormonal cycle, counted from the first day of full bleeding.

Ovulation predictor kit

A urine test detecting the hormone surge that precedes ovulation.

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