Comment: I think you are missing the important part.

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In reply to comment: Congratulations! There must (see in situ)

I think you are missing the important part.

Your wife needs to take her temperature at the same time, every night for the rest of your procreation life.

You can pinpoint ovulation to within a few hours.

It maximizes your chances.

After we gave up. We never stopped doing this.

It was actually a comfort to both of us and it became an extremely intimate minute or two for both of us every single night.

God Bless.