Just had my first scan and the doc gave me a due date but the date based on my last period was a bit different. Got a little confused how they actually decide it. Can someone explain how this works?
They go by your last period date mainly, then confirm with the dating scan. My due dates shifted a couple days after the scan both times. Its always an estimate though, very few babies actually arrive exactly on it.
My doctor counted from the first day of my last period and added forty weeks, thats the usual method. Then the early scan fine tuned the date based on baby's size. So between the last period date and the first ultrasound they get a fairly accurate due date.
