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Why are you considered two weeks pregnant at conception?

By Zaira Salvador B.Sc., M.Sc. (embryologist).
Last Update: 04/30/2018

Because the weeks of pregnancy are counted from the first day of the woman's last menstrual period. Keeping this in mind, technically the woman is not pregnant during the first two weeks of pregnancy. However, fetal development doesn't start until conception, which occurs about two weeks later (week 4 of pregnancy).

Related post: When Does Week 1 of Pregnancy Start? – Symptoms & Key Facts.

 Zaira Salvador
Zaira Salvador
B.Sc., M.Sc.
Embryologist
Bachelor's Degree in Biotechnology from the Technical University of Valencia (UPV). Biotechnology Degree from the National University of Ireland en Galway (NUIG) and embryologist specializing in Assisted Reproduction, with a Master's Degree in Biotechnology of Human Reproduction from the University of Valencia (UV) and the Valencian Infertility Institute (IVI)
License: 3185-CV
Embryologist. Bachelor's Degree in Biotechnology from the Technical University of Valencia (UPV). Biotechnology Degree from the National University of Ireland en Galway (NUIG) and embryologist specializing in Assisted Reproduction, with a Master's Degree in Biotechnology of Human Reproduction from the University of Valencia (UV) and the Valencian Infertility Institute (IVI) License: 3185-CV.