How to Use Ovulation Calculator
Just fill the below mentioned details in Ovulation Calculator and know your best time to get pregnant.
- 1st day of your last period
- Length of your cycle
NOTE: This tool provides approximate dates only and assumes a regular menstrual cycle.
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It also known as Fertility Calculator or Ovulation Calendar is a very useful tool. Ovulation Calculator is a tool which predicts your most likely to be fertile days and increases your chance of conceiving.
Day one is the first day of the cycle and the last day is the day prior to next period begins. Ovulation happens about two weeks before the next expected menstrual period. So if your average cycle is of 28 days, ovulation day must be 14th day. If your menstrual cycle is irregular, prediction may not be accurate.
What controls the ovulation?
During each cycle, your brain’s hypothalamus and pituitary gland send hormone signals back and forth with your ovaries. These signals get the ovaries and uterus ready for a pregnancy. An egg can live up to 12 to 24 hours leaving ovary. Now when you have used Ovulation Calculator, let us understand what is ovulation.
What is Ovulation
When a mature egg is released from ovary and pushed towards fallopian tube the process is called ovulation. Every month an ovum will be matured and released by one of the both ovaries and will be available for fertilization. Same way every month, the lining of the uterus has thickened to prepare for the fertilized egg. If no conception occurs, the uterine lining, as well as blood, will be shed. The shedding of an un-fertilized egg and the uterine wall is called menstruation. Have you tried the Ovulation Calculator on the top?
The phases of menstrual cycle:
The follicular phase (or proliferative phase) is the phase of the menstrual cycle during which the ovarian follicles mature. The follicular phase lasts from the beginning of menstruation to the start of ovulation, that is first 13 to 14 days of last menstrual period.
For ovulation to be successful, the ovum must be supported by the corona radiata and cumulus oophorous granulosa cells. The latter undergo a period of proliferation and mucification known as cumulus expansion. Mucification is the secretion of a hyaluronic acid-rich cocktail that disperses and gathers the cumus cell network in a sticky matrix around the ovum. This network stays with the ovum after ovulation and has been shown to be necessary for fertilization. An increase in cumulus cell number causes an increase in antrum fluid volume that can swell the follicle to over 20 mm in diameter. It forms a pronounced bulge at the surface of the ovary called the blister.
Estrogen levels peak towards the end of the follicular phase. This causes a surge in levels of luteinizing hormone (LH) and follicle-stimulating hormone (FSH). This lasts from 24 to 36 hours, and results in the rupture of the ovarian follicles, causing the oocyte to be released from the ovary via the oviduct. Through a signal transduction cascade initiated by LH, proteolytic enzymes are secreted by the follicle that degrade the follicular tissue at the site of the blister, forming a hole called the stigma. The cumulus-oocyte complex (COC) leaves the ruptured follicle and moves out into the peritoneal cavity through the stigma, where it is caught by the fimbriae at the end of the fallopian tube. After entering the oviduct, the ovum-cumulus complex is pushed along by cilia, beginning its journey toward the uterus.
By this time, the oocyte has completed meiosis I, yielding two cells: the larger secondary oocyte that contains all of the cytoplasmic material and a smaller, inactive first polar body. Meiosis II follows at once but will be arrested in the metaphase and will so remain until fertilization. The spindle apparatus of the second meiotic division appears at the time of ovulation. Fertilization occurs in ampulla.
If no fertilization occurs, the oocyte will degenerate between 12 and 24 hours after ovulation.
The mucous membrane of the uterus, termed the functionalis, has reached its maximum size, and so have the endometrial glands, although they are still non-secretory.
The follicle proper has met the end of its lifespan. Without the oocyte, the follicle folds inward on itself, transforming into the corpus luteum(pl. corpora lutea), a steroidogenic cluster of cells that produces estrogen and progesterone. These hormones induce the endometrial glands to begin production of the proliferative endometrium and later into secretory endometrium, the site of embryonic growth if implantation occurs. The action of progesterone increases basal body temperature by one-quarter to one-half degree Celsius (one-half to one degree Fahrenheit). The corpus luteum continues this paracrine action for the remainder of the menstrual cycle, maintaining the endometrium, before disintegrating into scar tissue during menses.
When ovum is not available for fertilization disintegration of the adaptation changes occurred in the endometrium occurs resulting in shedding of menstrual blood along with fertilized ovum. This usually lasts for 4 to 5 days.