thanks for contacting askthe doctor.com
The period of gestation is calculated from your last menstrual period.
For the EDD, you need to add 9 months and 7 days to your LMP as per naegle's formula and you would get your due date. You may calculate accordingly.
i hope i have answered your query
These Q&A’s are for educational purposes and should not be relied upon as a substitute for medical advice you may receive from your physician. If you have a medical emergency, please call 911. These answers do not constitute or initiate a patient/doctor relationship.