Conception and Fertility: What Happens During Ovulation?

Understanding Your Menstrual Cycle is critical to charting fertility and predicting ovulation. Read about your menstrual cycle - what happens pre and post ovulation - as well as what happens during ovulation and at the moment of conception.

 


The Dynamics of Conception and Fertility:
What Happens During Ovulation?


> Reproductive Hormones and Ovulation
> Understanding Your Menstrual Cycle
> The Luteal Phase
> Ovulation FAQ
> Stages and Processes of Ovulation

Predicting your most Fertile Periods
Understanding how the menstrual cycle functions - and what happens during ovulation - is key to the successful prediction of ovulation. But what happens exactly? Let's look at the dynamics of fertility and conception.

During your menstrual cycle, there are far more infertile days than fertile days. The fertile days are those when there is a possibility of conceiving a baby. However, within your fertile period - the window of opportunity for conception - there are also days of "peak fertility". Identifying these peak times, and planning accordingly, can help maximize your chances of becoming pregnant.

The Dynamics of Fertility
A woman's fertile period during her menstrual cycle, on average, lasts about 7 days. However, the most fertile period consists of the few days before ovulation. There are a number of reasons why this is the most fertile time. First of all, the amount of cervical fluid increases - and the consistency of the mucus changes substantially (from being sticky and cloudy to becoming transparent, white, and slippery). The purpose of this change is to create a healthy medium for the sperm to survive and travel in. Given a fertile environment, sperm can live several days. The egg, on the other hand, can live only 24 hours - so timing is important. At the moment of ovulation, the body temperature begins to rise to create a warmer, more hospitable environment for a fertilized egg. Also, the cervix will start to rise, soften, and begin to open up.

Hormones and Ovulation: The Release of the Egg
During ovulation, a number of different hormonal changes take place. Early in the menstrual cycle, a hormone called Follicle Stimulating Hormone - or FSH - enables your ovaries to nurture eggs. Within the ovaries, follicles house each individual developing egg. The follicles that hold the eggs will secrete estrogen. As the menstrual cycle progresses, the follicle containing the developing egg moves toward the surface of the ovary. Immediately before ovulation, the follicle begins secreting estrogen and progesterone. Estrogen helps the uterine lining thicken and expand, and increases blood flow to the uterus. Progesterone causes the glands of the uterine lining to form secretions that help nourish a fertilized egg once it implants in the womb.

Image of reproductive organs and follicle at the moment of ovulation.

By definition, ovulation is the process of an ovary releasing an egg from the follicle - permitting the egg to float down the fallopian tubes. On average, the first phase of the menstrual cycle last two weeks.

Directly prior to ovulation, another hormonal change takes place - the LH Surge. LH (or Luteinizing Hormone) is the hormone that actually facilitates ovulation: it causes the egg to separate from the ovarian surface. Ovulation predictor tests function by detecting this LH Surge, thus alerting the woman that ovulation is about to take place.

Click the link to read more about Hormones and Ovulation - and what the various representative lines in the graph above mean.

Once released from the ovaries (post-ovulation), the egg can survive for about 24 hours. This means that sperm (which can live several days, under ideal conditions) must be present to fertilize the egg. Following ovulation, the egg enters the fallopian tube and continues toward the womb. Typically, conception - the uniting of the egg and the sperm - will take place in the fallopian tube, and then the fertilized egg will continue its passage to the uterus and implant in the uterine wall. For pregnancy to take place, fertilization of the egg must be followed by a successful implantation.

Following ovulation, the luteal phase begins, marked by an increase of the hormone progesterone, which strengthens the uterine lining (endometrium), causes the body temperature to increase, facilitates changes in the cervical fluid, and alters the position of the cervix.

Within 24 hours, if the egg has not been fertilized, it will simply disintegrate after reaching the uterus. Without fertilization - and implantation - the levels of others hormones will ultimately drop during the luteal phase, causing the lining of the uterus to break down and shed - referred to as menstruation, or a woman's "period".

Implantation and Pregnancy

Fertilization occurs when a sperm penetrates the egg - and this typically takes place in one of the fallopian tubes. The fertilized egg then travels to uterus and implants in the uterine lining. At this point, the egg - and developing placenta - begin to release hCG (Human Chorionic Gonadotropin). The presence of hCG will help facilitate the continued production of progesterone - essential for a fertile, hospitable environment for the implanted egg. The hormone hCG will increase - and show up in a woman's blood and urine - making hCG a prime marker for pregnancy detection. Home pregnancy tests function by detecting hCG in a woman's urine.

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Comments

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I had unprotected sex today and surprisingly I have come on my period today as well... is it possible that I may be pregnant if he pulled out to late?

I had unprotected sex wth my bf on the 4 th day of my period, what are the chances of getting pregnant?

I had sex 3 days before ovulation and 2 days after is there a chance I can get pregnant ????

I first got my period then 14days later I knew my ovulation was on June 14,13. 5Days before my ovulation date (06-14-13) I had sex every day for 5days straight and even after my ovulation date just in case I was late. 5weeks later I did a home pregnancy test and I was pregnant. I didn't think you can get pregnant on your most fertile days like 9-14 days after your period. I only thought you can get pregnant while on your period but I was wrong. My doctor kind had a hard time understanding my due date cause it was off according to my period cycle, until I told him that I didn't have sex while on my period or even before my period but my most fertile window I did have sex. So my due date was basically according to my ovulation date and not by period. According to my first day of my last period my due date is: March 7,14. But now it's: March 16,14. This is my 2nd child now and after this baby no more for me. 2 is perfect.

I had unprotected sex (But he DID pull out) on Saturday, February 1st.. My period is due between the days of February 16th-20th, can I be pregnant?
P.S, I have no idea when I am fertile and when I am ovulating because my periods come at different times each month.

Btw, I do NOT want to be pregnant. I'm only 17 years old.

i had my period on 5 januari and had sex on 8januari and i had sex again 19 and 20 can i be pregant

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Hai,i hv a 28 day menstrual cycle and my period ended on the 29th of Dec and i had unprocted sex on the 14th day of ma cycle,could i b pregnant?

I had sex twice with my wife on the 2nd day of her menstruation, though she still ovulate could she get pregnant?

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Ovulation Calculator

Format: 7/28/2014
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By TTC veteran and mother of two, Elizabeth Andrews.