Why you might see this term
Sperm may remain able to fertilise an egg for several days. This is why intercourse before egg release can be relevant.
What to keep in mind
Ovulation timing varies even in regular cycles. A calendar estimate cannot prove which days are fertile and must not be used as contraception.
Sources & further reading
Prepared by ProFertility · Updated 23 October 2026.
Educational information based on the linked sources. This explanation is not an individual diagnosis or a treatment recommendation. A term appearing here does not mean the test is necessary or included in a particular kit.
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