Ganun po talaga, ang age of pregnancy ay talagang computed po based on LMP (Last menstruation period) and not the day of conception (which there's really no way of knowing). Kapag nagpa-ultrasound po kayo, yung EDD naman po doon ay based on baby's development/ size. Also, EDD means EXPECTED/ ESTIMATED Date of Delivery, and is not exact and usually give or take 2 weeks.
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Tere SC