July 2015 Moms

Confusion with due dates!!

Hi ladies!!! So according to every calculator I've tried, I'm due July 12th making me 7 weeks pregnant - but the first day of my last period was Oct 5th, making me 8 weeks and 1 day pregnant with a duedate of July 5th. I have my ultrasound on Thursday but all my symptoms line up perfect with week 8! Is anyone else as confused as I am about how it works?!?!

Re: Confusion with due dates!!

  • Hi ladies!!! So according to every calculator I've tried, I'm due July 12th making me 7 weeks pregnant - but the first day of my last period was Oct 5th, making me 8 weeks and 1 day pregnant with a duedate of July 5th. I have my ultrasound on Thursday but all my symptoms line up perfect with week 8! Is anyone else as confused as I am about how it works?!?!

    I'm confused too. Based on your LMP, the July 12th date sounds about right. How did you calculate the July 5th due date?
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  • They will tell you at your appointment. They measure the baby in the ultrasound. With us it was pretty easy we has a hsg done & got pregnant the next day lol
  • They will tell you at your appointment. They measure the baby in the ultrasound. With us it was pretty easy we has a hsg done & got pregnant the next day lol

    Not everyone gets a dating ultrasound. I am not doing one
  • They will tell you at your appointment. They measure the baby in the ultrasound. With us it was pretty easy we has a hsg done & got pregnant the next day lol

    Not everyone gets a dating ultrasound. I am not doing one
    OP said she had an ultrasound on Thursday so it was safe to assume it is a dating ultrasound and she will be given an edd based on that.
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  • They should still give her an idea of the EDD based on her last period. My last period was Oct 6 and my EDD is July 13. You are 7 wks, 1 day.
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  • I'm also curious how you got the July 5 date. If you ovulate on the late side (more than 14 days after your period started) that can definitely affect the calculators. I'd wait and see what you find out from the ultrasound.
  • When I went to the doctor to confirm my pregnancy, she told me I was 5 weeks based off my last period and that was nov 3rd. 3 weeks ago...5+3=8. The 5th was a Sunday so that was the first week...I looked on a calendar and counted weeks from oct 5th which puts me at 8 weeks - 40 weeks from Oct 5th is July 5th. Unless my doctor was wrong in telling me I was 5 weeks when really I was only 4?!
  • I think it's safe to assume she made an error in telling you you were 5 weeks when you were really only 4.  Sometimes mistakes happen.  If your last period was Oct 5 then you are in fact 7 weeks, not 8.  
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  • Yeah, Nov 3 is definitely only 4 weeks from Oct 5. I think she just made a mistake.
  • That's a relief hearing ovulatuon can muck up due date. My ovulation must have been out of whack, last period was September 27, had first ultrasound on Friday 14th November and was dated at 5 weeks 4 days when I thought I'd be closer to 7 weeks. Oh well. Currently at 7 weeks 1 day, due July 13th.
  • READY4TWOREADY4TWO member
    edited November 2014
    You must have ovulated later.  Based on the start date of my LMP on October 10 my due date would be July 17.  I ovulated on November 2 though, so my due date is actually July 26.  Calculating pregnancy from the start of your last period is only a guess.  
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  • That's a relief hearing ovulatuon can muck up due date. My ovulation must have been out of whack, last period was September 27, had first ultrasound on Friday 14th November and was dated at 5 weeks 4 days when I thought I'd be closer to 7 weeks. Oh well. Currently at 7 weeks 1 day, due July 13th.
    @biancamoyes , I ovulated on CD 27 so I can't go off of the standard calculator. Based off of my LMP which was Oct. 4th, I would be due July 11th, however; since I know I ovulated on CD 27 instead of around 14, My EDD should be July 20th. I go in next week for my first US to confirm my thoughts 

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  • I had my dating us today. I was told my was only changed one day from 7/2 to 7/3 but on the us one area says GA = 7wks 1 day and another area says GA = 8wks 2 days. Not sure what that means and why there are two listed
  • amc2511 said:

    Hi ladies!!! So according to every calculator I've tried, I'm due July 12th making me 7 weeks pregnant - but the first day of my last period was Oct 5th, making me 8 weeks and 1 day pregnant with a duedate of July 5th. I have my ultrasound on Thursday but all my symptoms line up perfect with week 8! Is anyone else as confused as I am about how it works?!?!

    I'm confused too. Based on your LMP, the July 12th date sounds about right. How did you calculate the July 5th due date?
    Yea it sounds like the calculations are wrong somehow. My lmp was sept 29th and my due date is July 6th. I'm 8 weeks today.
  • Ovulation and implantation dates can affect your due date. If I went by my lmp on September 18th that would put my due date at June 25th putting me at 9wks 4 days. But I charted my basal temp and know that I ovulated later on CD 25 putting my due date at July 5th. Today I had an ultrasound and it puts me at 8 wks 4 days and my due date at July 2 which confirms my temps.
  • The way a due date is calculated is subtract 3 months add 7 days. You can't just add 9 months to your LMP because you would be a week off.
  • What I'm confused about is, I have ALL the symptoms of week 8 and last week I had all the symptoms of week seven! I guess we'll know for sure on Thursday! Thank you everyone....I know it seems silly - this is my first so all this a VERY new to me!
  • What I'm confused about is, I have ALL the symptoms of week 8 and last week I had all the symptoms of week seven! I guess we'll know for sure on Thursday! Thank you everyone....I know it seems silly - this is my first so all this a VERY new to me!
    Every pregnancy is different. I'm always a week ahead compared to those too. No pregnancy is exactly by the book. They're pretty much generalizations.
  • Yeah what is this "week 7 symptoms" "week 8 symptoms." You can have symptoms at any time, or none at all. You could have absolutely no morning sickness your entire first trimester, or you could have it starting at 4 weeks, 5 weeks, 6 weeks, etc...I really don't understand that statement.

    Also, as PP's have stated, your EDD would be the 12th.

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  • draeray said:



    That's a relief hearing ovulatuon can muck up due date. My ovulation must have been out of whack, last period was September 27, had first ultrasound on Friday 14th November and was dated at 5 weeks 4 days when I thought I'd be closer to 7 weeks. Oh well. Currently at 7 weeks 1 day, due July 13th.

    @biancamoyes , I ovulated on CD 27 so I can't go off of the standard calculator. Based off of my LMP which was Oct. 4th, I would be due July 11th, however; since I know I ovulated on CD 27 instead of around 14, My EDD should be July 20th. I go in next week for my first US to confirm my thoughts 

    @draeray‌ they love to make it as confusing as possible don't they haha. Good luck :)
  • There are no symptoms by week. There are pregnancy symptoms. Yes, some change as you get further along (feeling baby kicks, for example). But um...yeah. That's not a thing. 

    Also, this is my two cents, I didn't have a dating ultrasound with DD and I wish I would have. I gave birth to her at 42.5 weeks. It was not fun. I wish I could have had a more accurate timeline. With this one, our new practice requires one. I'm thrilled. 
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  • My LMP was Sept 28, my EDD is July 5th. So I'm not sure how you having your LMP a week later gives us the same due date. July 12th should be your EDD based on your LMP.

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  • There are no symptoms by week. There are just pregnancy symptoms.

    Agreed. I started experiencing MS about two weeks earlier with this pregnancy than I did in my last one. Every woman and every pregnancy is different. While often MS kicks in high gear around weeks 6-7, there is certainly lots of variability and you can't date your pregnancy by the symptoms.

    OP, it definitely sounds like your OB just miscounted when she told you 5 weeks at your last appointment.


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  • @biancamoyes‌ wow our stories are almost identical. My LMP was sept 27th, first U/S was nov 14th & they back tracked me by one week(I thought I was 6w6d but they said I was 5w6d)
  • So in nursing school we learned to calculate the due date you go to the first day of your last period and then add a week. Mine was Oct 1st so that would be the 8th. Then you subtract 3 months. So July 8th... Then you add a year so 2014 becomes 2015. :-) Hope that helps! My doc changed my date from July 8th to 7th based on size but other than that, pretty accurate.
  • When I say week 8 symptoms, I mean according to what all the sites say is common in those weeks...
  • When I say week 8 symptoms, I mean according to what all the sites say is common in those weeks...
    no such thing.  Symptoms are symptoms and can occur at any time.  Calculating due date off of the start of your last period is simply guess work.  The amount of women who actually ovulate on CD 14 is not that high.  There is a lot of variation in ovulation dates.  Please don't try and calculate your due date based on what are typical symptoms for a certain week.   
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  • My LMP was September 28 and my EDD is July 5th
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