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The menstrual cycle

The menstrual cycle and Natural Cycles

Natural Cycles uses women's unique basal body temperature (BBT) readings and LH test results (optional) to pinpoint where a woman is in her monthly cycle - i.e. time of menstruation, ovulation, when she is like...

The fertile days (fertile window)

Your fertile days / the fertile window is the 6 day period in which a women can get pregnant from having unprotected sexual intercourse. The fertile window is determined by the sperm survival of 5 days and the ...

Using Natural Cycles when you have irregular cycles

Natural Cycles accurately captures every woman's unique cycle patterns by taking cycle irregularity, temperature fluctuations, recent usage of hormonal contraception, ovulation day variation, sperm survival and...

Does Natural Cycles take sperm survival into account?

Of course! In order to work effectively at finding your fertile and non-fertile days, Natural Cycles needs to take sperm survival into account. It is well known that sperm can survive up to 5 days in the femal...

What is Period?

Period is when a woman's body releases tissue that it does not need anymore. This tissue comes from the woman's uterus. Every cycle, the uterus lining gets thicker to prepare for a fertilized egg to arrive. If ...

What is the Follicular phase?

The Follicular phase is the first phase of the cycle, which starts with your period and ends with ovulation. During this phase, there's an increase of follicular simulating hormone (FSH) in the body, which make...

What is Ovulation?

Ovulation is the part of the menstrual cycle when one of the ovaries releases an egg (an oocyte). It is during this process that the egg travels down the fallopian tube, and may be met by a sperm and become fer...

What is the Luteal phase?

The luteal phase is the second phase of the cycle, and thus after ovulation and before menstruation. This phase ends when the period begins. After ovulation, progesterone is produced from the remains of the fol...

What is Luteal Phase Defect (LPD)?

Luteal phase defect (LPD) is when your ovaries doesn't produce enough progesterone, or the lining of the uterus (endometrium) doesn't respond well enough to the hormone. When the endometrium doesn't grow enough...

Can I ovulate (get pregnant) during my period?

Can I ovulate during my period? Yes, if you have a shorter cycle or a highly irregular cycle it's possible to ovulate while you are still bleeding although it's not very common. • A short cycle means that ovula...