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Making Baby 3, Part 14: Charting Ovulation with BBT

18 January 2008

Pink ThermometerWhen you’re trying to conceive a baby, the woman has to work out when she ovulates in order to find her most fertile days.

There are quite a few easy and free methods to predict ovulation. I’ve already written about charting a Cervical Mucus Chart, and it’s often recommended to try charting your Basal Body Temperature at the same time.

Basal Body Temperature (BBT)

The BBT is the body’s temperature when it is at rest. When you chart your BBT everyday, you can work out where you are in your cycle, and exactly when ovulation has occurred.

You have to take your temperature first thing in the morning (before you even speak), and at the same time each morning for a month.

Basically when you have a spike in your temperature, it indicates that you have ovulated. It also means that you are most fertile on the two to three days BEFORE the spike.

It all sounds very easy, but unfortunately it calls for scientific procedures that are much too tricky for me – that is, doing something brainy first thing in the morning.

I can hardly remember where I am and what my name is the moment I wake up.

Nonetheless. I have tried it, and yes I plot a good looking chart.

I’m aware that it doesn’t work for everybody, especially if you have a very irregular cycle, or if you’re sick etc. It’s also pretty time consuming, tricky to get it right and most professionals say women shouldn’t rely on it 100%.

However I found myself quite fascinated as I looked at my little chart.

This is because I also jotted down other regular patterns like: days when I’m depressed, days when my skin feels like crap, days when my hair is really shiny, days when I’m super energetic, days when I crave junk food, days when I’m snappy + irritable. And it’s actually quite freaky to see how predictable I am.

Sample of BBT Chart from

This is not my chart, but it gives you a really good idea of what a BBT chart looks like. You can read about how to chart your basal body temperature here.

Original image by GlobalB2B.