How do I date my pregnancy, so I know when I''m due?

If you are having regular periods (28 days between each cycle) and are not on the Pill then the pregnancy is dated in weeks from your last menstrual period (LMP). Your due date is 40 weeks after the LMP. Your pregnancy is not dated from when you think conception occurred. No matter whether you are sure when you conceived, in practice there is such a narrow window of a few days around ovulation in which fertilization can occur that we always date pregnancy from the LMP. At the time of your first missed period, therefore, you will be 4 weeks pregnant. If your periods are irregular, or you were on the Pill when you got pregnant, or you have a very long cycle length with infrequent periods, it is more accurate dating your pregnancy from an early ultrasound scan.
How do pregnancy test kits work?

Pregnancy test kits require you to test a sample of your urine. The absorbent wand reacts if a hormone called hCG (human chorionic gonadotrophin), which is produced by the embro, is present in your urine. As a backup, many kits include a second test.

How to use a test kit Not all kits look like the one shown here, but they work in basically the same way. Remove the test wand from the cap or cartridge. Hold the absorbent sampler in your urine stream for a few seconds. Replace the wand into the cartridge. Wait as directed. If you are pregnant, both windows will show a color.

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