The review, conducted jointly with researchers from Oxford University, the Royal Berkshire Hospital in Reading, and the Princess Anne Hospital in Southampton, included seven randomised controlled trials involving 2,464 women or couples who had been trying to conceive. Each month there is a narrow window for successful conception due to the limited lifespan of the sperm and egg, which begins from around five days before ovulation (egg release) and lasts until several hours afterwards. The period of a woman's cycle can be identified by different methods, including urine ovulation tests (dipstick devices that can detect changes in hormones released into the urine, signifying when ovulation will occur), fertility awareness-based methods (FABM) (including calendar tracking, monitoring changes in cervix fluid and body temperature) or identifying when the egg is released on ultrasound.

https://www.miragenews.com/family-planning-timing-everything-1084909/

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