Sign Up for my FREE Fertility eBook & eCourse

Understanding BBT Ovulation Charts

Ovulation charts help detect abnormality in your menstrual cycle and help you while trying to conceive and overcome reproductive difficulties.

Basal body temperature (BBT) is useful in helping you determine if you are ovulating and to determine how long your luteal phase is. Unfortunately, measuring your basal body temperature will not tell you when you are about to ovulate, which is the most fertile phase of your cycle.

If you want to know when you are going to ovulate a few days in advance, you should consider purchasing OvaCue Fertility Monitor.

Using this type of ovulation tracking device will be very helpful, but I still recommend measuring your BBT in order to maximize your conception efforts and gain important insights about your body and your unique fertility signs.

Basal Body Temperature (BBT) Ovulation Charts

Charting your cycle using the basal body temperature (BBT) method is the cheapest and easiest most convenient and effective way to chart your fertility.

Let's review the principals of tracking your BBT to achieve conception:

 1. Take your temperature each day as soon as you wake up before you do any activity.

2. If your using a digital thermometer wait until it beeps and record your value.

3. Take you temperature each day at the same time, or within one hour.

4. Identify the first day of your temperature rise two-tenth of a degree higher.

5. Identify 6 low temperatures before the rise.

6. Draw the coverline one-tenth of a degree above the cluster of six temperatures.

7. After the third consecutive high temperatures above the coverline you are no longer fertile.

8. You are usually not fertile during your period and if you cervical mucus is dry.

9. You are fertile just before you thermal shift and when you have fertile mucus.

10. Some women have a temperature dip before the temperature rises at ovulation.

11. If you have 18 consecutive high temperatures you might be pregnant.

12. If your temperature drops below the coverline, you will have you period soon.

Click here to get your printable Ovulation Charts.

Ovulation Charts Analysis

When the temperature dip or the temperature rise occurs you know you have already ovulated or are ovulating in the next 12 hours.

Having sex at this time will most likely be too late.

In fact, you should have sex one or two days before your thermal shift to make sure that when you ovulate, the eggs will be fertilized because sperm lives within your reproductive tract for at least three days, even up to five days.

Tracking your basal body temperature is very important to understand your fertility patterns within your menstrual cycle.

Ovulations charts can tell you numerous things about your fertility:

1. If you are ovulating.

2. When you are ovulating during your cycle.

3. If your luteal phase is long enough for implantation to occur.

4. If you progesterone levels are adequate.

5. If you have infertility related to thyroid disorders.

6. If you are pregnant.

7. You may be at risk of miscarriage.

Ovulations Charts Help You Determine The Length Of Your Luteal Phase

The luteal phase should be at least 10 days long and it is measured by the number of days between the first day of rise in temperature and the first day of your period.

If you have spotting before your period, do not count these days as part of your true period. When determining the length of your luteal phase these days are still part of your previous cycle.

The first day of your period starts when your have normal blood flow not spotting. Spotting before menstruation is considered normal if you have atleast 10 days of high temperature without spotting before.

Otherwise it is an indication thatthe corpus luteum is starting to break down too early and stumulate premature shedding of th euterine lining causing a miscarriage or preventing implantation.

Spotting can also be associated with endometriosis, fibroids, polyps, thyroid, etc. Using progesterone cream helps support the corpus luteum and prevent early miscarriage.

Ovulations Charts Determine Pregnancy

You know you are pregnant if your BBT stays high for more than 18 days in a row. This is very important because some women have a very light period and are still pregnant. The only way to know is by doing a pregnancy test or to notice that your temperature is still high.

Ovulation Charts and Risk of Miscarriage

1 in 3 pregnancy may end up in a miscarriage. When charting your BBT, a sudden drop in temperature shows a potential risk of miscarrying.

Short Luteal Phase Ovulatory Charts

Charting your BBT will provide important information on the lengths of your luteal phase. If it is too short (less than 10 days) your will have difficulty remaining pregnant because the embryo does not have enough time to implant and send hormonal signals that prevent the menstrual period.

So, you could conceive but yet not be able to carry the pregnancy. This piece of information is very important in the type of treatment chosen. If you do ovulate but have a short luteal phase you need progesterone.

The herbal remedy Vitex agnus castus and 200-600 mg of Vitamin B6 daily are better more natural option than Clomid, HCG injections, or progesterone suppositories.

Also, natural progesterone cream delivers progesterone this hormone through the dermis to support the luteal phase and implantation.

Do not apply progesterone cream if you are taking Vitex. Talk to a health care practitioner.

Ovulations Charts and Ovulation

The analysis of your ovulation chart is important because some women do not ovulate when they think they do, while others do not ovulate al all.

A typical ovulatory temperature pattern clearly shows a temperature shift anytime between day 8 and day 22. Remember, not every woman ovulates on day 14.

Normal Ovulation Charts

Take a look at the following chart. 

As you can see ovulation occurred on day 18, the length of the menstrual cycle is 31 days and the luteal phase is 14 days long.

This is a very healthy ovulation chart that could have lead to pregnancy if intercourse was timed properly.

You can also notice a drop in temperature that is related to the coming of the menstrual period and the beginning of a new cycle.

Anovulatory Ovulation Charts

Anovulatory charts are characterized by a lack of thermal shift. If you do not ovulate your ovulation chart will have no clear temperature shift and your will not see a spike at mid cycle. You can still get your period, which is called anovulatory bleeding.


A very long cycle that ends up in heavy flow can be anovulatory if you suffer from polycystic ovarian syndrome. In this case you will notice very long and irregular cycles. This is caused by hormonal problems due to excess LH, FSH and testosterone. The ovaries are insulin sensitive.

High LH and FSH levels stimulates excess estrogen production (estrogen dominance), which causes monophonic temperature charts, which indicate a lack of ovulation. Myo-inositol supplementation helps lower insulin levels and allows a natural ovulation cycle.

This supplement is promising in the treatment of insulin resistance conditions but can cause side effects like nausea, uterine contractions, and may interact with certain medications. I recommend following a specific PCOS diet can help improve this condition naturally.

Other natural solutions include Vitex to stimulate progesterone production and modulate the hypothalamus or pituitary glands. It also reduce level of prolactin ( hyperprolactinemia) that causes irregular cycles. 

Hypothyroidism And Ovulation Charts

Having your period does not tell you that you ovulated that month. An anovulatory temperature pattern is common a couple of times a year. If you have a long infertile cycle with low temperature you may be suffering from hypothyroidism.

Thyroid infertility is a very common condition in women who are trying to conceive and often under diagnosed. A natural treatment involves herbal remedies to assist functioning and bring hormonal balance.

Once you support your thyroid gland to produce appropriate amounts of thyroid hormone, your menstrual cycles will become regular and you will finally ovulate each month.

Some women will do well with natural herbal support while others will need prescription thyroid medication depending on the results of blood testing. Usually natural remedies help those who are classified being borderline hypothyroid.

Improve Your Charting Skills

When you first begin charting your cycle, you will notice many variances related to your unique hormonal patterns. The more you can learn about charting, the better your ability to detect your fertile day.

If you are serious about getting pregnant, solving your fertility issue, you really need to plan your pregnancy. It is a known medical fact that women who plan their pregnancy, have higher chances of increasing their chances of conception.

I would recommend reading "Taking Charge Of Your Fertility"  that teaches you more about fertility charting and natural conception planning. I know you will find it really useful.

Fertility Blessings!

Return from Ovulation Charts to Fertility Charting
Return to Natural Health for Fertility Home Page