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LMP 5/24<br>
BDed day 6/13 almost midnight<br><br>
I was calculating March 06 as my due date calculating from conception and u/s tech said I should "always" need to go by LMP. I somehow conceived 3 weeks after LMP not the usual 2 weeks o day for many women, so I'm confused.<br>
The tech moved back my due date as Mar 01. Does this sound right?<br>
This means I was pregnant the first 3 weeks when I didn't have conceive instead of the usual 2 weeks.<br>
Help me understand better, please.
 

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If you know for absolute certain when you ovulated then I would say go with that date. It would be crazy to change it if you know.<br><br>
I'm guessing the tech said you always go from LMP because thats what is usually done?<br><br>
I would always fight to give myself more time to have the baby rather than less!
 

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It sounds like you know when you conceived, and that's the date you should go by (unless there's any chance you could have gotten pregnant earlier). I've had this argument with a few u/s techs because I O'd around cd 21 AND had really big babies. But since we use donor sperm, I was 100% sure about my conception dates. One tech even tried to tell me, "well just because you were inseminated doesn't necessarily rule out the possibility that you got pregnant before the insemination." Um, yes, it does? <img alt="" class="inlineimg" src="/img/vbsmilies/smilies/eyesroll.gif" style="border:0px solid;" title="roll"><br><br>
You certainly don't want to be worrying about being "post-dates" earlier than you should be. Never move your "due date" to an earlier date (moving it to a later date is a different story).<br><br>
And, just anecdotally, my LMP with my first pregnancy was 5/25, I was inseminated on 6/10 and my edd was 3/03 (and my twins were born 2/18). My sister also had an LMP of 5/25 (two years after me), an unknown conception date, and an edd of 2/28. Her baby was born on 3/15.<br><br>
Lex
 

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<div style="margin:20px;margin-top:5px;">
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<table border="0" cellpadding="6" cellspacing="0" width="99%"><tr><td class="alt2" style="border:1px inset;">One tech even tried to tell me, "well just because you were inseminated doesn't necessarily rule out the possibility that you got pregnant before the insemination." Um, yes, it does?</td>
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Oh thats a good one! <img alt="" class="inlineimg" src="http://www.mothering.com/discussions/images/smilies/lol.gif" style="border:0px solid;" title="lol"><br><br>
Don't you know the technology is never wrong? If it has to be immaculate conception then thats what it has to be!!
 

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After charting for years I know I ovulate late every month. So when I went to my first prenatal visit I "adjusted" my LMP date to match my EDD with my O date. I didn't want to be forced into early labor or scheduled c/s because my dates were off..
 

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Why is an ultrasound tech setting your due date?!!! I don't think you even have to have a bachelor's degree for this job.<br><br>
Sorry, but that's not his or her job, honestly. They can read ultrasounds, but if you know your date of conception and you've discussed with your care provider, it's not their place to change it. Most providers get an 8 weeks ultrasound to confirm dates, because it's most accurate in the first trimester, but after that it can be off. Don't change your date now, that's more likely to put you into induction land.
 

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I ovulate late in my cycles and still knowing o date I go 2 weeks late. So if I went by lmp I would be like 3.5 to 4 weeks late! It is important to go with known conception if its possible.<br><br>
This time I had lmp on 7/13 and didn't o till 8/6. I am going with my O date.
 

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you could just subtract 2 weeks from conception date and say that is your LMP. But, for sure, you probably want to be sure that your midwife knows your dates and forget about the u/s TECH.<br><br>
Since my first was 3 weeks early and my second almost 3 weeks late, we have no expectations on when this one will be born. We're just hoping it's December ! There is almost 2 weeks' of discrepancy based on my dates and the u/s dates.<br><br>
--janis
 

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I agree to go by conception date. My OB uses LMP unless a first trimester ultrasound shows 2 weeks off! That's a huge range! (And only higher risk women have a first trimester ultrasound with my dr, but I'm included in that). The fetal maternal specialist was questioning my dates after my ultrasound two days ago showed the baby 10 days ahead. But there's no way I'd change it since I wouldn't want the baby evicted early. (Plus, I'm certain of dates and all the ultrasounds I had with my RE can back it up).<br><br>
The ultrasound tech had nothing to do with my due dates in ANY pg. The tech can say what the EDD is according to the us, but my OB doesn't change it unless it's off by a lot. (And then usually just in first trimester).<br><br>
*My LMP was May 29 and my EDD is March 5. However, I ovulated on cd 14 or 15 and DH had chemo on cd 16, so there's no question about when conception was possible!
 

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Go by conception date. My first pregnancy was due 12/13 by LMP but I didn't actually conceive until nearly 4 weeks after LMP making baby actually due 12/31.
 

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Yep. When you go in just tell them that your LMP was your conception date minus two weeks. Or, you can do what I did, and actually forget when your LMP was, and go by when you had sex. THAT I remember. <img alt="" class="inlineimg" src="http://www.mothering.com/discussions/images/smilies/orngbiggrin.gif" style="border:0px solid;" title="orange big grin">
 

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<div>Originally Posted by <strong>pantufla</strong> <a href="/community/forum/post/12352179"><img alt="View Post" class="inlineimg" src="/community/img/forum/go_quote.gif" style="border:0px solid;"></a></div>
<div style="font-style:italic;">Yep. When you go in just tell them that your LMP was your conception date minus two weeks. Or, you can do what I did, and actually forget when your LMP was, and go by when you had sex. THAT I remember. <img alt="" class="inlineimg" src="http://www.mothering.com/discussions/images/smilies/orngbiggrin.gif" style="border:0px solid;" title="orange big grin"></div>
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Yep. Just adjust your LMP. It's not worth arguing constantly with ignorant techs or nurses, honestly.
 
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