Understanding the Start of Pregnancy: What Counts as the First Week
There is no such thing as the "first week of pregnancy". Pregnancy is typically counted from the first day of the last menstrual period (LMP). This is because ovulation usually occurs around 14 days before the start of a period, so the first day of the LMP is considered to be the day that the egg was released from the ovary.Pregnancy & Health - Related Articles
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