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Old May 24th, 2017, 10:54 AM   1
TTCfirstovr30
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How was your EDD calculated?


First Day of Last Menstrual Period (LMP) or Date of Ovulation?

I have been going off of my Date of Ovulation because I had IUI, so 10/31 which brings my EDD to 7/23. However, I am measuring big and now questioning if I should be calculating using my LMP which would be 10/12 and bring my EDD to 7/7.

Anyone have advice on which EDD would be the better one to go off of if you had IUI? We DTD pretty much the entire month so I can't pin point when we actually conceived. Thanks!



 
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Old May 24th, 2017, 13:21 PM   2
OnErth&InHvn
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in the end it doesnt matter when your IUI was... its all an estimate really



 
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Old May 24th, 2017, 16:06 PM   3
second.time
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I'd just go by whatever your medical professionals are using. It is an estimate, and only about 5% of babies are born on their due dates anyway, but your doctors should have a good idea of where you are. Have you asked your doctor which date you should use? Two weeks does make a difference!

I use my LMP even though I ovulate early and have short cycles ... might not be perfect, but it gives me a general sense. Once you reach like 37 weeks you'll probably be impatient anyway, in my experience.



 
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Old May 24th, 2017, 16:11 PM   4
TTCfirstovr30
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I told my OB that I didn't O until 10/31 so she went with that. But now Baby is big and I worry that I may have told her the wrong date and should be going with LMP. I wouldn't mind but 2 weeks is a long time and if I go earlier I will still be working and nothing will be done! lol



 
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Old May 24th, 2017, 17:26 PM   5
second.time
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Quote:
Originally Posted by TTCfirstovr30 View Post
I told my OB that I didn't O until 10/31 so she went with that. But now Baby is big and I worry that I may have told her the wrong date and should be going with LMP. I wouldn't mind but 2 weeks is a long time and if I go earlier I will still be working and nothing will be done! lol
Do you think she could change it for you? I do know my son was measuring 10 days ahead at his 20-week scan and they still didn't adjust my due date! But maybe an IUI would change that? I understand wanting to get as accurate a date as possible. It's worth asking your OB about in case it makes a difference.



 
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Old May 24th, 2017, 21:59 PM   6
DobbyForever
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My first appointment was booked based on my LMP. My EDD was calculated by baby's measurements at my 9w prenatal then changed by one day at my 12w nt scan. Which matched my O date. No idea on how to help with the iui/bd and narrowing it down



 
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Old May 26th, 2017, 05:49 AM   7
vaniilla
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LMP, since the 12 weeks scan is used for dating they only go on your lmp here.



 
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Old May 27th, 2017, 17:45 PM   8
Marriedlaydee
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My LMP today is 6 weeks 3 days. But my gestation today is 5 weeks 5 days. I think it's important to know and communicate it if u know for certain when you ovulated especially if like me you know you ovulated CD20. It's a massive difference!

I have an early scan next Thursday I did warn them that I won't be 7 weeks 1 day when they see what's hopefully there. I'll be 6 weeks 4 days though so fingers crossed they still see baby and that flicker!!!



 
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Old May 29th, 2017, 11:34 AM   9
IchigoMewMew
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LMP is only used in first tri here, after tge 12 week scan that date is used as genetics and environmental factors can influence the baby's size. Are you referring to growth scan measurements or fundal height?



 
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Old May 30th, 2017, 06:41 AM   10
MindUtopia
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Initially, it should be by LMP accounting for your cycle length. So if you didn't ovulate on day 14, but instead have long cycles, then LMP should still account for that (but that calculation still puts ovulation at the mid point of your cycle, which could still be off by a bit if that isn't actually when you ovulated). But after 12 weeks they should be going by CRL measurements. So when you had your 12 week scan, they should have taken a crown-rump length measurement and adjusted your date by that, which is more accurate, and that would account for the IUI date. Most people have their dates adjusted then, of course, the window of baby's birth is still give or take about 5 weeks at term. If they didn't adjust your date, I would ask them to go back and have a look at those measurements and make sure they line up.



 
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