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Most Fertile Period of the Cycle - How to Calculate?

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Ovulation is the most fertile phase of the menstrual cycle, about 14 days after the start of the last period. Read on more to know about it.

Medically reviewed by

Dr. Raveendran S R

Published At November 10, 2022
Reviewed AtNovember 10, 2022


The menstrual cycle is a measure of fertility. It is when ovulation occurs, and the chances of getting pregnant are at their peak. The period date marks the beginning of the menstrual cycle, meaning they have 10 to 14 days left before ovulation. This article helps to identify the most fertile period of the menstrual cycle and how it works.

What Is the Most Fertile Period of the Menstrual Cycle?

The exact time during an ovulation cycle when a woman is most likely to get pregnant is unknown. Based on studies or research, it is impossible to pinpoint the day of the menstrual cycle when ovulation occurs. However, some indicators can help to identify the most fertile period in the menstrual cycle. The most fertile period in the menstrual cycle could be one to two days before ovulation. This is the time when women are most likely to conceive. If they want to get pregnant, this is the best time to do so. If women want to get pregnant fast, they should start having sex at least two days before ovulation. This will give them more time to conceive and lower the risk of miscarriage. Some women may experience a surge in hormones and an increase in fertility on day seven. While others may have a surge on day 21.

How to Check Basal Body Temperature (BBT)?

For most women, the best way to identify the most fertile period in their menstrual cycle is by tracking their basal body temperature (BBT). This is possible because their basal body temperature (BBT) rises when they ovulate.

They can also use an ovulation test kit to calculate the most fertile period in their menstrual cycle. To get pregnant fast, they first need to track and chart the basal body temperature (BBT). Women can do so by taking their BBT every morning before leaving bed. A digital BBT thermometer is recommended to get an accurate reading. Once they have been tracking their BBT for a few weeks, they can clearly identify two key things- the pattern of their fertility and the most fertile period in their menstrual cycle.

When Does Conception Take Place?

When calculating the most fertile period in their menstrual cycle, they should also know when conception occurs. Conception is when a sperm meets an egg to form a zygote. This zygote eventually turns into a fetus and then an infant through a nine-month-long pregnancy. Conception takes place when the sperm has fertilized the egg. This happens when the sperm travels through the vagina, the cervix, and the uterus. The sperm then meets the egg in the uterus and travels down the fallopian tubes to the ovaries.

What Are the Factors Affecting Ovulation?

Several factors can affect ovulation, including stress, weight, diet, exercise, drinking alcohol or smoking, specific disorders like diabetes or thyroid, and medications. Stress can disrupt the body’s natural hormone balance, impacting ovulation. Being overweight or underweight can also affect ovulation. Exercise can affect ovulation by affecting the body’s hormone levels, and some medications can also interfere with ovulation. Estrogen and progesterone hormones help to build up the lining of her uterus in the first half of the menstrual cycle.

How to Chart Menstrual Cycle?

The menstrual cycle is a regular process that happens in the female body. It is a series of changes that happen to prepare the female body for pregnancy. There are a few different ways that women can chart their menstrual cycle. One way is to keep track of the first day of their period on a calendar. It is also important to monitor their menstrual cycle by recording their daily basal body temperature. Another way to chart their menstrual cycle is to track their cervical mucus.

Women can use any combination of methods to chart their menstrual cycle. By tracking their menstrual cycle, they can better predict when they will ovulate and when their period will start. If women are trying to conceive or want to avoid getting pregnant, tracking their menstrual cycle can be helpful.

What Is the Period of Ovulation?

Ovulation is the release of an egg from one of the ovaries. It usually occurs about 14 days after the start of the last menstrual period, but the exact timing may vary from woman to woman and from cycle to cycle. The ovary releases an egg into the fallopian tube, which may be fertilized by sperm. If the egg is not fertilized, it passes out of the body during menstruation.

There are a few reasons why it takes six days for ovulation to occur. First, sperm can live inside the body for up to five days. This means that if they have sex on the day of ovulation, the sperm will still be alive and can fertilize the egg. Second, it takes the egg about 24 hours to travel from the ovary to the uterus. So, fertilization can technically occur up to five days after intercourse. However, the chances of conception are much lower than in the most fertile period.

When to Get Support?

If someone has been trying to conceive for six months without success, it may be time to seek specialist advice. This is especially true if they have any reason to believe they may have a fertility problem. A variety of fertility tests can be utilized to diagnose any potential problems. These tests can be expensive, so it is important to ensure they have exhausted all other options before pursuing them. If someone has been trying to conceive for more than a year without success, it is time to seek specialist advice. Infertility is a very complex issue; the sooner they get help, the better their chances of success.


Women have been trying to figure this out for ages and are always looking for new, more effective ways to become pregnant. It is important to be aware of the fertile period of the menstrual cycle because around the time of ovulation is when they are more likely to get pregnant.

Frequently Asked Questions


How Can One Calculate Their Most Fertile Period?

Ovulation occurs about 14 days before one's period starts. For example, if one has a 28-day cycle, one may ovulate around the 14th day, and the most fertile days include 12, 13, and 14. On the other hand, if the average menstrual cycle is 35 days, ovulation occurs around the 21st day, and the most fertile days are the 19th, 20th, and 21st.


How Can One Know if One Is Fertile Enough to Get Pregnant?

Below are the signs that may show one is pregnant, 
 - If one has never had a pelvic infection.
 - If one has a very regular cycle.
 - If one's periods were not extremely painful.
 - If one doesn't smoke cigarettes. 
 - If one's period was not extremely heavy.
 - If one is having signs of regular ovulation.


How Long Does It Take for the Sperm to Reach the Egg When One Is Ovulating?

The sperm reaches the egg around 15 to 45 minutes after ejaculation. However, the process may be longer than if one had not ovulated by the time one had sex because the sperm may live inside the reproductive tract and wait for the egg for up to five days.


Can One Get Pregnant When They Are Already Pregnant?

One baby has protection through the placenta, amniotic sac, and mucous plug that covers the cervix. This protection system blocks the sperm from growing into the baby while coming into contact with the partner's penis.


How Soon Will a Pregnancy Test Get Positive?

One can do most pregnancy tests on the first day of the missed period if one is unaware of the next period's due date. One can go for the test at least 21 days after having their last unprotected sex. Sensitive pregnancy tests can be used before one misses their period.


How Can One Know When Ovulation Has Passed?

Below are a few signs that indicate when ovulation is over.
 - When there is a loss of libido.
 - Decreased abdominal pain.
 - Change in the cervix position.
 - Checking the basal body temperature.
 - Changes in the cervical mucus. That released cervical mucus in larger quantities during ovulation.


How Can One Confirm When the Sperm Enters Their Cervix?

The sperm should be able to swim through the cervix through the cervical mucus because of their swimming ability. Nothing will help the sperm get into the cervix other than the sexual act. These sperm swim into the mucous independently, which may require activity.


How Much Time Can One Lay On Their Back When Trying to Get Conceived?

Laying down for about 15 minutes after the sex may help the sperm go in the right direction by giving them some extra time to increase the possibility of pregnancy. And also, certain positions may enhance the ability to conceive.


Can One Feel When the Sperm Enters the Egg?

No one cannot feel when the egg is fertilized.


What Should One Avoid Before Taking a Pregnancy Test?

One should avoid drinking too much liquid or water before taking the pregnancy test. Excess fluids may interfere with the accuracy of the results. So if one's urine is diluted or pale yellow, hold off while taking the test. Diluted urine tends to have diluted HCG levels that can give inaccurate results.
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Dr. Raveendran S R
Dr. Raveendran S R



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