No Temperature Rise After Seeing Fertile Cervical Mucus? Here's Why.

Usually, a temperature rise on a body basal temperature chart indicated ovulation.
Usually, a temperature rise on a body basal temperature chart indicates ovulation. But a small percentage of women ovulate but still do not see this rise in temperature. iStockPhoto

A reader asks: "I get days of fertile cervical mucus, but I don't get a sustained rise in temperature on my body basal temperature chart. Instead, my temperature seems to be all over the place. Does this mean I'm not really ovulating?"


Usually, fertile cervical mucus - a watery to raw egg-white like vaginal discharge - will precede ovulation. If you're charting your body basal temperature, and ovulation occurred, you'd expect to see a sustained +temperature rise within a few days of seeing your most fertile cervical mucus.

If you don't seem to get a temperature rise at all, it could be for a few different reasons.

Possibility #1: You May Not Be Ovulating

It could be that you're not ovulating. While fertile quality cervical mucus can warn you that ovulation is coming, so you can time sex for pregnancy, it doesn't confirm that ovulation actually took place. You can have fertile quality cervical mucus, but not ovulate.

This is more likely the case if you also have irregular menstrual cycles, or extra short or long menstrual cycles.

Possibility #2: You May Not Be Charting Your Temperatures Carefully

When charting your body basal temperature, you need to be meticulous about taking your temperature at about the same time every morning - including the weekends - and doing so before you even get up to use the bathroom.

Also, if your sleep schedules are not consistent, maybe because you work nights or have very young children that you care for throughout the night, that can also throw off your temperatures.

Possibility #3: You May Be Part of the Small Percentage of Women Who Do Not Get a Temperature Rise

While most women will have a small rise in their body basal temperature after ovulation, there is a small percentage of women who do not get one.

You may be one of them!

In that case, the only way to know if you're ovulating is to have ultrasound confirmation that ovulation is taking place(or your doctor may order a blood test during what would be your two-week wait) to check for progesterone levels. (Progesterone levels should be higher during the two-week wait if ovulation took place.)

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