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Understanding your menstrual cycle

To most women, their menstrual cycle is a nuisance, unless trying for a baby. Understanding your menstrual cycle can help improve your fertility and chances of having a baby. Below are extracts from My Fertility Guide on when to try and conceive a baby naturally.

The word ‘menstrual’ comes from the Latin for ‘month’ and the word ‘month’ comes from the Latin for ‘moon’. In Chinese medicine the menstrual cycle is also related to the moon. Historically, a woman’s menstrual cycle would have followed the lunar cycles. The moon is yin in traditional Chinese medicine, as is a woman and the blood that she releases through her menstrual cycle.

Length of the menstrual cycle

A normal menstrual cycle is around 28-29.5 days long, which follows the moon’s length of change. When woman are taking birth control meditation, the cycle is general very predictable. However, in some women the menstrual cycle can become irregular when they stop taking the pill.

The different stages of the menstrual cycle

The menstrual cycle is made up of two sub-cycles: one for the ovaries and one for the uterus. Regulating both of these cycles is key to good fertility. The main hormones involved in the ovary cycle are follicle stimulating hormone (FSH) and luteal hormone (LH), whilst the main hormones involved in the uterus cycle are oestrogens (oestradiol) and progestins (progesterone).

The ovarian cycle is made up of two phases; the follicular phase which is yin and the luteal phase, which is yang. The follicular/yin phase is the maturing of a dominant follicle that contains the egg. The luteal/yang phase is the release of the egg into the fallopian tube, insemination of the egg by a sperm, the moving of the egg down the fallopian tube and implantation of the fertilised egg into the uterus wall (endometrial lining). The uterine cycle involves the breakdown of the uterus lining, when a woman has her menstrual bleed in the initial follicular/yin phase and the building up of the uterus lining to its peak in the luteal/yang phase.

Menses

At the start of a women’s menstrual cycle, the entire uterus lining sheds due to levels of estrogen and progesterone dropping in level, which are needed to sustain it, causing the start of the menstrual period. A good period flow should last between 5-7 days and be heavy for the first 3-5 days, then reduce to medium then light. Typically, a woman will lose 50-90ml of red blood without clots. If the blood is dark, is not heavy on day 1 or has clots, then this is an indicator of a problem with the menstrual cycle. Premenstrual symptoms, commonly perceived as normal, are also indicators of problems with the menstrual cycle and therefore fertility. Acupuncture is very good at treating premenstrual symptoms and problems with menstrual blood flow, thereby improving the menstrual cycle and fertility.

Proliferative phase

As bleeding takes place, the hypothalamus releases gonadotropin-releasing hormone (GnRH), which causes the pituitary gland to start the production of FSH. This in turn stimulates the follicles to grow. Yin starts to increase up until ovulation. The number of follicles a woman has is fixed from birth. It is possible to measure the number (and quality) of eggs from an AMH test. It takes around 85 days for an egg to develop from start to finish. Follicles sit in a procession and their quality is affected by a woman’s underlying health. The better their health, the better the egg will be that’s in the follicle. Between 10-20 follicles are stimulated in one menstrual cycle. As the follicles mature, one becomes dominant and releases oestrogens, whilst the others fade away. There are three oestrogens; oestradiol, oestrone and oestriol. Oestradiol is the most abundant of the three and therefore the main one to consider in fertility.

As oestrogens surge, they repair and regenerate the endometrial lining within the uterus. The uterus lining will gradually thicken reaching its maximum thickness around day 21. The optimal thickness is 8+mm with a triple lining. This triple lining is the three layers that make up the uterus wall. As one follicle becomes dominant, oestrogen levels rise steeply increasing the thickness of the endometrial lining and the start of LH production, which helps the egg to ripen and eject from follicle sack. The mature egg then releases inhibin, which turns off the production of FSH. At around day 14 to 15 in a typical 28-29.5 day cycle, there is a massive release of LH from the pituitary gland.

Ovulation

The LH surge typically occurs 34-36 hours before ovulation. This LH surge is used by ovulation kits to test when it’s the right time for couples to have intercourse. However, surges in LH can vary from woman to woman, The LH surge also pulsates, so it’s not continuous and therefore ovulation kits may not always detect the LH surge. I would recommend watching your body’s own signs of ovulation instead of using ovulation kits, which are often expensive, inaccurate and can potentially cause stress.

The surge in LH causes the release of the egg from the ovary. At this point, the follicle is around 18-25mm in size and has reached maturation. This occurs roughly 9 hours after the LH peak. At this point yang starts to grow and becomes the dominant force in the luteal phase. Yang is involved in fertilisation, the movement of the egg along the fallopian tube and its implantation into the uterus wall. The egg has 24 hours to be inseminated by a sperm.

Secretory phase

The high LH levels that trigger ovulation also promote the production of the main progestin hormone; progesterone. Progesterone maintains the flow of blood supply to the uterus lining, thereby maintaining it. The uterine lining should be at least 7-8mm thick. It also tells the pituitary gland to stop producing FSH and increases the production of immune cells that aid implantation. Progesterone levels remain high for about a week and drop off if pregnancy is not achieved, causing the disintegration of the uterus lining and the period to begin.

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My Fertility Guide - How To Get Pregnant Naturally

My Fertility Guide: How To Get Pregnant Naturally

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