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When Are You Most Fertile After Your Period?

Finding the time when you are at your most fertile is one of the things you’ll need to devote a lot of energy and research to when you decide you’re going to start a family. There are lots of different ways for you to find that ‘fertile window’ – the days when sperm have the best chance of surviving long enough to fertilise a freshly ovulated egg – but most of them rely on finding out when you ovulate, but this can be tricky.

The most ‘visible’ event of your menstrual cycle is your period: and you can use this to begin calculating when your ovulation will fall, and when you’re going to be at your most fertile. Finding out when you are most fertile after your period requires some equipment – shortcuts are available for some people, but the most universal method requires:

  • A calendar (or app with similar functionality)
  • Graph paper (or Microsoft Excel, or a BBT tracking app)
  • A thermometer, specifically, a Basal Body Temperature Thermometer

One of the most accurate methods for finding out when you’re fertile is charting your basal body temperature. The first, and most basic step is to record the date of the first day of your period. Tracking this from month to month allows to see the length of your menstrual cycle, and whether its regular, or varies from month to month.

Menstrual cycles can be long or short – anything from 21 to 35 days is considered normal in adults, with teenagers who have just passed puberty seeing an even wider range, as their body adjusts to this new state of affairs. Within that range, many people’s cycles are very regular: if you go 35 days from the beginning of one period to the next in one cycle, it’ll be 35 times the next, and the next, with occasional distortions from stress or health issues.

Other people have less regular cycles, meaning it could be anywhere within that 21 to 35 day range for any given cycle – this is still considered normal, medically speaking. If it drifts outside this range, then there may be deeper medical causes at work.

Taking your temperature first thing in the morning let’s you get a reading of your Basal Body Temperature – the minimum temperature your body drops to overnight. If you record and chart this temperature every day, you’ll see changes as your cycle progresses. A pattern of a drop of one tenth of a degree followed by a three day rise shows your body is first preparing to ovulate and has then released an egg.

If you can identify when you ovulate within your cycle, you can use your period as a signpost, and count after it to find the fertile days after it, and boost your chances of conceiving!

Find out more about core temperature technology and fertility here