I noticed the Pregnancy thread was locked ..so i decided to post and tell this
Iam a doctor so I know that when we calculate in Obstetric the due date and GA we always use the "first day of menstural period "..that's why always in you first visit the Clinic the nurse wll ask you when was the first day of your last menstrural period...which is usually about 14 days before "conception which usually around ovulation" ..why we use that because we can't ask a woman about which time she had sex with her husband is the one that was LUCKY to make her pregnant so we ask about the first day of the last menstural period using certain equation to know the due date and GA..
I hope that made things clearer ...Salwa

