# For How Many Days Are Humans Pregnant?

Depends when the baby is born, doesn't it? Some are born months earlier than their "due" date, some are born weeks later.

Conventionally in the Western world, pregnancy is said to last 40 weeks. The first 2 weeks of that are before the woman has even ovulated or the egg has been fertilised. The next 7-10 days after fertilisation, the embryo is floating around and growing (dividing) -- but it hasn't implanted in the woman's body yet. She doesn't know she's pregnant; so is she really pregnant during this time? it's not guaranteed that the embryo will ever implant, in fact... so wouldn't it make more sense to date pregnancies only from the day when an embryo actually did implant?

Bit hard to pin down, isn't it all?

40 weeks = 280 days.
38 weeks (from fertilisation) = 266 days.
36.5 weeks (from implantation)=256 days.

So I would say that typically, we can expect a pregnancy to last 256 days. And full term babies can be born any time between 235 and 277 days after implantation.
thanked the writer.
A full term human pregnancy is to 259 - 280 days or 37-40 weeks.

This is calculated from the first day of your last period.
So to be more accurate
If conception took place 14 days after the first day of your last period.
You need to subtract 14 days from the 259-280 days.

However, the way the medical community gages it.
A woman is considered 2 weeks pregnant the day she conceives
because they chart the pregnancy
from the first day of the last menstrual cycle.
thanked the writer.
280 days
thanked the writer.