See a gynecologist or fertility specialist if this applies to you. By Nicole Harris Updated September 26, Save Pin FB More. By Nicole Harris.
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The calculator figures out your estimated day of ovulation by counting 15 days the average length of your luteal phase in this example backward from the 35th day the average length of your cycle of your cycle. While online ovulation calculators are available, you can also do the same math yourself to determine your most fertile days rather than relying on an online prediction tool.
In fact, women and doctors have been doing these calculations on paper for decades. Just follow the example above but plug in your personal last period start date, cycle length, and luteal phase length if unknown, use 14 days. For more help on this, see detailed instructions below, and to confirm you are doing it correctly for your particular medical situation, consult with your doctor.
You can use the calculator above or one you find elsewhere or create your own ovulation calendar. The chart will give you a rough estimate of when you may be most fertile. To use this chart, you need to:. By definition, they are based on averages, and even if you've been charting your periods, your cycle length and ovulation date can vary cycle to cycle.
If your periods tend to be irregular, you can calculate your average cycle length and then give yourself a wider fertility window. If your cycles are shorter than 21 days or longer than 35 days, however, consult your healthcare provider; they may recommend some testing to find out why. Luckily, you don't need ovulation prediction tools to be absolutely precise in order for them to be helpful.
When trying to conceive, you don't necessarily need a specific date but rather a generously wide range of potentially fertile days. If you are looking for approaches to identifying your fertile window that are more precise than ovulation calculator tools, consider trying the following:.
If you want a slightly more accurate ovulation calendar, consider using a fertility or ovulation app on your smartphone to assist you. Fertility apps that ask for your basal body temperature and other fertile signs as well as allow you to adjust data based on your own observations are the most accurate. That said, if you want to keep it simple, some programs only ask for your period dates and, as a result, will give you effectively the same information as ovulation calculators.
But even with these apps, the fertile window dates are still an approximation—and some programs are better than others. These apps are also useful for when you show up for your annual gynecology exam and the doctor or midwife asks when your last period was.
Some apps to try include:. An important caveat to the effectiveness of ovulation calculators is that they are less reliable when you take fertility medications like Clomid clomiphene or Femara letrozole , which can disrupt your natural cycle. Don't rely exclusively on ovulation calculators if you're taking Clomid, as your cycle on Clomid may be entirely different than when you aren't taking the medicine.
Some people try to use ovulation calculators as a form of "natural birth control. However, as explained above, it's not uncommon for cycles to vary, meaning your average infertile days one month might become your most fertile the days the next. An ovulation calculator that is only using dates and averages can't tell you with certainty when and when you're not fertile.
If the calendar says you will likely be ovulating on a particular day, you should consider the week before and after that date as potentially fertile days.
Additionally, you may also use an ovulation calendar is for deciding when to start using an ovulation test or ovulation predictor kit. Get diet and wellness tips to help your kids stay healthy and happy. Menstrual cycle length and patterns in a global cohort of women using a mobile phone app: Retrospective cohort study. J Med Internet Res. Alternatively, there are a number of apps that will do this for you — such as Clue.
By using the ovulation calculator above, you can work out your ovulation date. The best advice would be trying naturally every days soon after the period is over till day 20 of the cycle, but it could be extended depending on the length of the cycle. When you ovulate, you may notice a change in your discharge and a slight increase in temperature or change in urine ovulation predictor kits.
This is because sperm can survive for several days in the reproductive system so as long as you are having sex every couple of days it is not important to get the timing to coincide with ovulation. When your next period starts, make a note of the date.
The following month, when your period comes again, make a note of this date, then count the days in between. This will give you your cycle length. Remember also that coming off the Pill will reveal your true menstrual cycle.
Using our ovulation calendar, find the right number in the menstrual cycle length column 33 for the above example and read across for your ovulation day and most fertile days. Once you know your ovulation date, as a rule, you are most fertile the day before, during and the day after. These figures are based on averages and should be used as a guide only.
Days and dates may differ from person to person. In fact, fertility specialists may not even advise bloods to check if ovulation has happened because regular cycles are a sure sign of ovulation. The best way to track fertility is through your natural fertility indicators, fertility nurse Kate Davies says, which includes checking your own temperature and cervical mucus.
You can choose to use systems to help you interpret your physiological data such as Apps and fertility monitors and some women also choose to use ovulation predictor kits to help identify when ovulation is about to occur.
Have a look at some of these easy tools to find out your ovulation date and fertility window…. Make use of this at-home urine test to work out the two days of the month that you are most fertile, making it that little bit easier to conceive. This test is easy to use and easy to read, making the whole process as simple as possible. According to Clearblue, this test is "clinically proven to double your chances of getting pregnant in the first cycle of use, versus not using ovulation tests".
This ovulation test is connected to phone, to make it that much easier to track your most fertile days with the click of a button.
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