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How to Calculate Ovulation Day

The day that you ovulate is one of the most important days in your calendar when you’re trying to get pregnant. Ovulation is the key event that anchors your fertile window – the days in each cycle when sperm have a chance to survive long enough to encounter a fertile egg.

If you’re trying to boost your chances of conceiving, you need to know when your next ovulation day is. This lets you set a plan for the month, allowing you to take advantage of that fertile window, when you stand the maximum chance of success.

There are several different ways to calculate when you’re going to ovulate. Not all of them are suitable for every person, but it’s worth investigating all the possibilities to find the one that works best for you.

Keeping a Calendar

If you track your cycle day by day, you may be able to tell in advance when you are due to ovulate and therefore when the best time is to try to conceive. If you record the date of the first day of your period in each cycle, you should soon have an idea of how long your cycle lasts. If you have a very regular cycle, this could be enough to tell you when you’re going to ovulate!

Most people ovulate around 14 days before their period, so if you know when your period is due you can predict when you’re going to ovulate! Some apps and online fertility trackers can make this a little easier, but it’s not a helpful method if you have a less than regular cycle, or don’t know when within your cycle ovulation tends to happen.

Ovulation Predictor Kits

If you need more confirmation of when ovulation falls within the menstrual cycle for your body, then you might want to try OPKs. These kits test your urine for levels of the Luteinising Hormone that causes you to ovulate and gives a positive result when it detects the surge levels that lead to an egg being released from the ovaries.

These are quick and convenient, but they don’t always get you an accurate answer. If you have any kind of hormone disruption, it makes it very hard for these tests to help you: the information they need is obscured and they can’t adapt.

Basal Body Temperature

Measuring your core temperature (the basic, minimum level it drops to during a period of extended rest) can get you an accurate way to calculate your next ovulation even if your hormone levels are being disrupted by conditions like PCOS. OvuSense uses a specialised sensor to get accurate temperature readings from you right through the night, then uses a tested algorithm to calculate your ovulation day accurately and gives you a prediction you can rely on.