international way (roughly): last MC + 40 weeks (280 days)
But later when you see the doctor, he will let you know. Using ultrasound information etc.
It seems it may also take into account of the actual duration of the MC cycle (some of the people are not 28 days)
There is a way to get the estimate delivery date.
Say, your last M cycle is in March, and the first day of your M cycle is on 1st March. Count back 3 months from 1st March 2006 which is 1st Dec 2005, then add one year, it becomes 1st Dec 2006. If your M cycle in March lasts for 30 days, then add 15 days to 1st Dec 2006. The 預產期 to be 16 Dec 2006. This is just the estimate, doctor will further make the estimation after viewing the fetus by ultrasound.
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