Beyond,
When u calculate based on last menses date, it usually assumes a cycle of 28 days. The scan machine usually calculates based on the size of the sac to estimate the gestation age.
Just like me, if i calculate based on LMD, it'll be 12 oct but i know it's not right cos this time round, my cycle is longer (that's why i got pregnant cos i thought it was safe period). And according to the scan machine, my EDD is 23 oct.
Not to worry too much. As the term EDD suggest, it's just an estimate plus / minus about 1 week.
When u calculate based on last menses date, it usually assumes a cycle of 28 days. The scan machine usually calculates based on the size of the sac to estimate the gestation age.
Just like me, if i calculate based on LMD, it'll be 12 oct but i know it's not right cos this time round, my cycle is longer (that's why i got pregnant cos i thought it was safe period). And according to the scan machine, my EDD is 23 oct.
Not to worry too much. As the term EDD suggest, it's just an estimate plus / minus about 1 week.