kiraan week n day preggy

Bole tnya, Mcm mn kira minggu n hari utk preggy ?? kira dr last period or scan kandungan..?? mcm sy kalo ikut dr last period 11 week 4 days..tp bila scan kandungan nmpk 9 or 10 week..bilang doc faktor lmbt hari...jd mn satu yg d ikut kiraan nya?

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Ikut tarikh edd yg dktor bagi dlm buku pink