Using a Fertility Calendar to Predict Ovulation

Using a Fertility Calendar to Predict Ovulation

The calendar method predicts ovulation by looking at a woman's menstrual history. Ideally, the calendar method should be used in conjunction with other predictive strategies, like observing cervical fluids, changes in the position of the cervix, and BBT charting. Also, the calendar method can be used to determine when a woman should start using ovulation tests - products that detect her "LH Surge".

For a more comprehensive calendar method, consider creating a Fertility Chart: using several predictive methods together to pinpoint your most fertile window for conceiving.

The calendar method is designed to predict general trends based on past menstrual patterns - and is therefore limited in terms of "pinpoint accuracy". The more regular a woman's cycle, the more effective the calendar method is - and perceiving ovulation patterns begins to crystallize after a few months of maintaining records.

With the ovulation calendar method, a written record is kept using a calendar to follow the patterns of each cycle. Each cycle begins with the first day of one's menstrual period and ends with - but does not include - first day of the next (which should be recorded as the first day of the next cycle).

How Chart and Read Your Ovulation Calendar

The day menstrual flow begins is 'Day One'. Circle this date on the calendar and notate as 'Day One'. For each following month, circle Day One and continue this for for at least 7-8 months.

Continue maintaining a record of the number of days in each cycle. When bleeding starts, circle the date on your calendar.

To determine the first day you are likely to ovulate, examine your records from previous months, find the shortest cycle, and subtract 18 from the total number of days.

For example, if your shortest cycle is 28 days long, subtract 18 from 28, which leaves 10. Starting with the date you circled (Day One, the first day of your current cycle) count ahead ten days and draw an O (for 'ovulation') through that second date. This day will be the date you are most likely to become fertile.

Again, the calendar method of ovulation prediction is best used in concert with other methods discussed in the Fertility Charting section - or with ovulation predictor kits.

Download Fertility Chart

Comments

i had my period on the 5th of november when is my fertile days.

my ovulation day is nov. 11, 2013 but i have my 1st day of menstruation and we contact november 5 my last menstruation is october 28 suppose to be my next period is on november 28 is it possible that im pregnant?

My last period was September 9 it lasted about 4 days. I had sex on October 1 ( no condom, no birthcontrol, he came inside of me twice in one night ) . Can I be pregnant?

I'm totally confused..

My cycle came on september 18,2013 n my cycle is 30 days .. whats my correct ovulation date

i got 9 and finish 12 this month my menstruation.and we got contact this 19 is possible that i get pregnat.pls answer me.i really want to have baby ang my bf too.

maam i want to get pregnant and my bf wants too.but really i dont know what is right date or time to do a baby.before i have boyfriend .we get sex too but im not getting pregnant.so im so confuse.do i have problem...my ex bf now married to someone else and had baby too.and now i got my new love wants me to get pregnant.so pls help me.advice me well.tnx

maam i want to get pregnant and my bf wants too.but really i dont know what is right date or time to do a baby.before i have boyfriend .we get sex too but im not getting pregnant.so im so confuse.do i have problem...my ex bf now married to someone else and had baby too.and now i got my new love wants me to get pregnant.so pls help me.advice me well.tnx

ask ko lang po sa first day ng unsafe period may possibility ba na mabuntis ang girl? thanks po

will i be pregnant if i have my menstruation last october 26 and we had a contact this day?

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Ovulation Calculator

Format: 10/26/2014
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By TTC veteran and mother of two, Elizabeth Andrews.