Why do we calculate the length of a pregnancy from the first day of a women’s last period?
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I’m not a doctor, but I am pregnant! My due date was based on the first day of my last period until my first ultrasound.
This is because it’s difficult to know exactly when you ovulate & conception occurs. I tracked my ovulation so we actually did know, but then you also have to consider the implantation process.
The embryo does not begin dividing cells and growing until it is implanted in the uterus. After that, a pregnancy test will show up positive.
Using your last period won’t always be the most accurate, but it is the easiest to track! Plus, due dates can always be changed after a dating scan if need be.
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