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Can you get pregnant on your period?
Variability in the phases of the menstrual cycle.
What is Fertile Window and Right Time for Sex - Imprimis IVF
Figure 1 from The length of the fertile window is associated with the chance of spontaneously conceiving an ongoing pregnancy in subfertile couples.
Fertility awareness - Wikipedia
What changes happen to your body during ovulation? - Ziva Fertility
Fertility Awareness Method for Conception - Talida Voinea
How Long Does Ovulation Last? – Forbes Health
Biomarkers of Ovulation and the Fertile Window: A Research Summary
At what time of the month is a woman fertile? - Quora
PDF) Day-specific probabilities of conception in fertile cycles resulting in spontaneous pregnancies
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