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Except in threatened pregnancies (for example, in pre-eclampsia), "lying-in" or bedrest is no longer a part of antenatal care.Due date estimation basically follows two steps: Distribution of gestational age at childbirth among singleton live births, given both when gestational age is estimated by first trimester ultrasound and directly by last menstrual period.
This was believed to calm the mother and reduce the risk of premature delivery.
About 80% of childbirths occur between 37 and 41 weeks of gestational age, with a somewhat more narrow span when based on first trimester ultrasound.
Given that these gestation lengths are only estimates of an average, it is helpful to consider gestation time as a range of dates rather than as a single "due date".
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If problems occur you may be advised that delivering your baby earlier is the safest option.
For advice on recognising signs that you are going into labour, or for information on some types of pain relief in labour, follow the links.
Another method is by adding 9 months and 7 days to the first day of the last menstrual period.