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When is my Ovulation Date?

Finding out when you’re going to ovulate is one of the most important things you can do if you’re trying to get pregnant. Ovulation is the keystone of your whole reproductive cycle, and knowing when it is means you can plan to try to conceive at the time when you’re most likely to succeed. This is known as your ‘fertile window’: the time when sperm can survive long enough in the reproductive system to meet the egg released from the ovaries.

You can do a lot to lengthen your fertile window with dietary changes and supplements: the better quality building blocks you can give your body to make these cells, the longer they can survive, and the longer your fertile window is. Healthy eggs and sperm also stand a better chance of combining successfully and developing into a foetus.

However long your fertile window, you need to know when you ovulate in order to identify it, predict it, and make your plans around it.

What Changes When You Ovulate?

There are three key things that change in your body in the build up to ovulation that you can check and track to give you an indication of when you’re going to ovulate:

Your hormones change – it’s hormonal changes that your body uses to control the whole reproductive cycle, so finding out when your hormones reach certain key levels can tell what stage of the cycle you are at.

Your body temperature changes too. If you can measure your basal body temperature – the low level your core temperature drops to during a long period of rest, such a night’s sleep, you can spot changes which indicate where in your cycle you are.

Your cervical mucus also alters as you approach menstruation: it’s normally a thick barrier to prevent toxins and foreign bodies penetrating too far into your body, but when you’re fertile sperm need to be able move through the cervix, into the uterus and up into the fallopian tubes. This means your cervical mucus has to change when you get close to ovulating.

Measuring Changes

You can check your hormone levels with so called OPKs – Ovulation Predictor Kits. These work like pregnancy tests, checking your urine for hormone levels. They’re convenient and available in most chemists and supermarkets, but they’re not always accurate. There’s debate about the best time of day to use the test, and if your hormone levels are different to the ‘average’ the test is calibrated for it can give you either false positives or false negatives.

While the change to your cervical mucus is dramatic, it’s also subjective and open to interpretation. If you’re inexperienced and unsure, it’s best used as a back-up verification, paired with another method.

OvuSense believes that it’s your BBT (Basal Body Temperature) that gives the best indication of when you’re due to ovulate. Our system combines accurate temperatures taken throughout the night, to ensure the best data, and a tested algorithm that turns those data points into a prediction of the next time you are due to ovulate.