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4. How Is Pregnancy Calculated?

Chemical pregnancies occur within the first five weeks, but calculating the beginning of a pregnancy is not as straightforward as you might think. Pregnancy is counted from the first day of a woman's last normal menstrual cycle, not the date of conception. This means that, in most cases, during what is considered the first two weeks of pregnancy, the woman is not yet pregnant. Since chemical pregnancies occur within the first five weeks, they happen within the first three weeks from conception when a lot of women do not yet realize they are pregnant.

Weeks Pregnancy Calendar Kwangmoozaa / Getty Images

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This site offers information designed for educational purposes only. You should not rely on any information on this site as a substitute for professional medical advice, diagnosis, treatment, or as a substitute for, professional counseling care, advice, diagnosis, or treatment. If you have any concerns or questions about your health, you should always consult with a physician or other healthcare professional.