Confused about due date?

Question

Hello! I am a little confused about my due date and how far along i actually am.

The first day of my last period was 2/14 which puts me at a due date or 11/21. I had my first Ultrasound on April 4, which would technically have put me right at 7 weeks.

The doctor measured me at 6wks 3dAys at my appointment on 4/4 but said she would not be adjusting my due date. So of course on all of my <a href="https://play.google.com/store/apps/details?id=com.glow.android.nurture">pregnancy tracker</a> apps, my due date is still 11/21 but i am measuring further along than what my ultrasound said.... silly, but it is driving my crazy! I want to be 4 days further along like my apps say lol!

So i guess my question is, do ultrasounds consistently measure the same rate? Example: when i go back for my next ultrasound on 5/2, will i be measuring 10wks 3 days (inline with my first appointment) or is it possible i would have somehow moved further along? Maybe a dumb question, but i have only ever had one ultrasound so i just don’t know! Thanks everyone!

Answer

This is exactly what happened to me!! According to my last day of my period and ap I’m due 11/20 but then when I went in for my 8 week scan she told me I was 7 weeks 3 Days but she wasn’t changing my 11/20 due date. I was worried like is my baby not growing fast enough and I hate that it’s not in sync with my ap too but she said that the scans are estimates and if I know my last period date my prediction is more accurate. It’s comforting to hear the exact same thing happened and that we are fine and our babies will catch up :)

Answer

Per my LMP I am due 11/20 but based on how I was measuring at my first appointment, I’m due 11/18 (my sister’s birthday). I’d love to tell my sister I’m due on her birthday but is that not technically true? I could also just be more general and say I’m due on Thanksgiving which is the 22nd. It’s fun to have a due date to track to! Since it’s all a guessing game, I’m thinking either way is fine to announce to folks!

Answer

Yes it is possible that the date will move around every appointment however they typically won't change the actual due date unless it's seven days or so. Babies grow at different rates so as long as you're sure that the first day of your last period is that date then I wouldn't worry about it.

Answer

It depends on your baby’s growth rate most times! #2 measured consistently 5 days ahead and was 21.5 inches long and at almost 3 years old, she’s 5 inches shorter than her sister who will be 6 in October! However I knew my dates from tracking my cycles and knew when conception occurred.. and my dad is 6’3” so I knew my kids would be tall. Lol.
#1 measured 2 days ahead at one scan, then 3 days behind for the rest of the pregnancy. 
It really just depends on genetics there sometimes I think. Lol

Answer

My due date is 11/21 too 😍. Sometimes babies just don’t fit the normal measurements, my best friend is 34 weeks and her son has measured 2 weeks ahead since about 16 weeks, but they didn’t adjust the due date because her last baby was big. Unless they are sure they are wrong they don’t adjust.
  My first due date was 11/3, but I knew it was wrong ( my lmp was 1/27 but my ovulation teat wasn’t positive until 2/27). They had to adjust when they did my first ultrasound because it confirmed what I had said about my ovulation test. (I have PCOS)

Answer

We're almost due date buddies. My last period started 2/15 which made my due date 11/22. When we went for our first u/s, baby measured at exactly 8 weeks not 8w5d. So our due date was changed to 11/27.

Answer

Measurements this early don’t mater what your measuring . When you get later on into the 30 weeks then if changes need to be amended it would ! Your baby could just be bigger

Answer

Measurements vary all the time. The earliest US (at 9 or 10 weeks) is the most accurate according to my OB, but no measurement is perfect! Based on my last period I'm 10+ weeks, but baby measures 9+ weeks (Dr adjusted my due date accordingly). I figure I ovulated later than I thought and that's why baby measures younger than the app says.

Answer

My second ultrasound I measured 5 days behind and this last one I measured right on time 🤷🏼‍♀️ it changes all the time. Don’t stress bc trust me I did!

Answer

Due dates are not an exact science, so it really doesn’t matter a few days here or there.  
Your period gives you a good starting point to estimate the due date, unless you have an unusually long or short cycle. 
Most doctors will stick with the date estimated by your period unless the original ultrasound measurement suggests a date more than a week. 
The measurement/date correlation I believe is all based on averages so further in your pregnancy you could be measuring behind or ahead but that won’t change your due date, it just means your baby is bigger or smaller than average. But the further along you are the less likely it is they will adjust your due date.

Confused about due date?

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