Won't be exact though! Thankyou all. Yes that does help.
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Too early and everything is so small that the slightest measurement can make a difference. That's not a massive difference though! I would go with your scan date, if your first scan was before 13 weeks I know some areas first scan isn't til My first was at nearly 14 weeks - so guess i cant really use that then.
How do you decide due date from scan?
Tbh, unless you're IVF you'd pretty much never know anyway! You would never know whether the sperm that fertilised the egg was a slower swimmer from Fri that was laying in wait for your egg being released - or a fast swimmer from Sunday that pipped it to the post! Also, embryos grow at different rates and can implant on different days. So you might think 'the' occasion was Sunday - when in fact it was after fertilisation on Friday but the ebryo took a little longer than average to get going.
And of course - they come when they're ready anyway, so it doesn't make that much difference to your real birth date! Who knows. G's EDD was put back 10 days after our dating scan. But babies rarely appear on their due date anyway. As usual, I've been given some different advice to MarineGirl - why do health professionals never sing from the same hymn sheet??
FWIW I have strange cycles so hard to know conception date but for my last pregnancy, the date they gave me at the 12 week scan was the day on which LO arrived, so I am going by that date again this time!!
Accuracy of Ultrasound in Dating your Pregnancy
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How to Calculate Your Due Date
Joined: Wed Apr 15, am Posts: 0 Location: sunny somerset. To be honest, I thought I was 2 weeks in front of my Due date.. I went into my dating scan thinking I was 12 weeks and 3 days but I was only 11 weeks and 3 days.
resaedu.com/includes/nytyzyvy/477.php Its so common to lose between a few days to a few weeks at your dating scan. No pregnancy is textbook so changes that happen to your body and symptoms you get don't happen at a certain time.
When you calculate your due date from your last period you know you aren't pregnant for at least the first few days of it because you're on your period and then it may be a further 2 weeks before you ovulate, depending on your cycle if you get me so at the beginning after that period you're not actually pregnant. Dating scans are the most accurate to go by. I dunno if that made sense Mine was wrong hun.
They put me over a week ahead which was impossible as I knew the date of conception and I was still on my period when they reckoned I conceived plus I was in the process of moving at the time too didn't just have one big moving day spread it out over a week so the only way my 12 week scan was right is if it was immaculate conception in which case I will sell my story to the paper and never have money worries again lol. I really don't have much faith in them to be honest. They're good for checking any developmental problems but as far as dating goes every baby grows at a slightly different rate.
A 5lb baby that grows into a 4 foot 8 person isn't going to be the same size as a 10lb baby that ends up growing to 6 foot 5. I have 10lb babies in my family all through my mums side so didn't surprise me that the dating scan said the baby was bigger but they still insisted that there dates were right and mine were wrong. Like I said in that case I should be rich.