Due Date Calculation??

[Lance06]

I am just curious.....because when I first found out I was pregnant, I figured out my due date to be February 15th. My LMP was May 11th (28 day cycles). However, when I went to the doctor on June 26th, the doctor told me that I was 6w5d and that my due date is February 12th. This would put me at 11 weeks on Saturday. However, whenever I go to a site and type in my due date, it tells me I am a couple of days ahead. For instance, babygaga.com if I put in my due date it tells me that I am 11 weeks today. That is what I have been going by....

Does anyone else understand this????

[KM604]

My due date - based on every website I checked was February 13th - my LMP was 5/9 so that is pretty accurate.  But when I went in for my u/s at what I thought was 8w6d, the doctor went by what the baby measured with was 8w3d.  So then he used his little wheel thing and said the due date is February 17th.  It's funny though because my OBYGN delivered my sister (20 years ago) and my mom told me "it'll be funny if he still has that wheel!" and he did - LOL.  I have also heard you have 2 weeks before and 2 weeks after your due date for when the baby could come.  So your next u/s the baby could measure a few days ahead or behind and who knows if they will keep the same date or change it.

[kelliestarr]

Your welcome :)

[Lance06]

Thanks for the info! Its just nice to know what day it is!....

not that the baby will come on that day....most likely..but i just want to know!

[Lance06]

Thats what I thought....and thats what I originally came up with ..but doctor told me Feb 12th.....I think they are just trying to confuse the heck out of me..!!!

thanks kellie!

[kelliestarr]

Ok you posted:

My LMP was May 11th (28 day cycles).

Which would make you 10 weeks right now and due on Feb 15/09. So this Sunday you will be 11 weeks.

[JJety]

Your doctor must be basing your due date from your u/s, because you're right that calendar-wise your due date is Feb. 15th.  

An early u/s is pretty accurate and doctors use those to adjust your due date.  Some doctors don't change the calculated calendar due date unless the u/s shows a 7+ day discrepancy, but apparently your doctor dates pregnancies based on the u/s no matter what.

So, just go by the what the doctor said because she used the u/s.  And like everyone else said, a couple days here or there don't make a difference.  So today you're 10w 6d with a due date of Feb. 12th.

[jesslee83]

since most babies don't bother to come on their expected due dates
i love that lol!!!
my DSS came on his original and only EDD....DF's ex said she would have him that day, and she was exactly right! she hit labor at like 9am, but they did an emerg c-sect that afternoon....either way, looks like joey was not missing "his" day lol.....

[Lance06]

Thanks for the input everyone.....They scheduled my 12 week ultrasound for tuesday...so hopefully they can tell me how my baby is measuring and then I can get a better idea on its growth and all that good stuff. Tuesday cannot come quick enough!!!

[mamaofonetrying42]

I bet you do, but again 2days doesnt make a hold lot of difference. I would just go off of what your dr. is saying!

[Avanaar]

I know some of the online calculators not only ask you when your LMP was, but how long your cycles usually are.  Those little wheels the doctors use are based on an average 28 day cycle.  I know mine's usually around 32 days, so with my first pregnancy, it was off by nearly a week.

Once you have an ultrasound tho, the doctor will base your due date off of how big the baby is measuring.  However, this can still be 'off' if your baby hasn't grown properly or is growing a lot!

Lastly, since most babies don't bother to come on their expected due dates, I wouldn't worry too much about pinning down a certain day.  Maybe having a changing due date won't be so bad (unless, of course, it keeps getting farther and farther away and baby needs to get his butt into the world!).

[Lance06]

I have had one ultrasound already...but it was when I was at 6 weeks. My next u/s is tuesday, maybe they can tell me more then.
Its just confusing...i would like to know if I am 11 weeks, or 10w 4d.....

[jesslee83]

yea i'm having that also.....even with a due date of oct 25, i should start my weeks on thursday....but an online calculator using the same EDD, says i am 26.6 weeks, rather than 25.6 weeks....idk, but i get your confusion.....also, my doc doesnt count like tickers do, 0w0d, he only counts 0w....

[mamaofonetrying42]

Have you had a u/s yet? If no, the dr. is just using a wheel and for some reason I have found them to be off alittle. Once you have your u/s your dr. will go off of that! But really a few days doesnt matter to the Dr.'s. I know it does for us.LOL