(Closed) Confused about due date

posted 7 years ago in Pregnancy
Post # 3
48 posts
  • Wedding: July 2009

I had a similar problem in my first pregnancy.  For starters, there are due date calculators available online that can calculate your due date based on conception date.  You just plug in your estimated conception date, and you’ll get an estimated due date.

But your doctor will most likely do an ultrasound on you to date the pregnancy.  Via a series of measurements, they’ll be able to estimate your due date.  These ultrasounds are usually pretty accurate.

Congratulations, mama!

Post # 4
5006 posts
Bee Keeper
  • Wedding: October 2018

From what I know, you still count it from your last period. So… whenever that was. That puts you at 6-7 weeks. Or you could add 2 weeks to the date that you believe you concieved. Most women concieve 2-ish weeks after their period. That would make you about 5 weeks. 

If you’re concerned about getting it as accurate as possible, talk to your doctor. They can measure the baby with an ultrasound and give you a more realistic due date. 

Post # 5
1621 posts
Bumble bee
  • Wedding: September 2012

The “LMP” (first day of the last menstrual period) way of dating is very (? too) common, but it’s only accurate if 1) your cycles were regular and 2) you know what that day is (within a day or 2.

Given that you say that your cycles weren’t very regular, the best bet would be to go with a dating ultrasound.  Between 8 and 12 weeks the range of error is 5 days or less (usually).  

Also, if you are pretty certain about concieving Aug15-18 (eg. that’s the only days you had sex,  or from charting), that can also be used to date, and you’d add 2 less weeks than the LMP method.




Post # 6
7152 posts
Busy Beekeeper
  • Wedding: October 2010

Actually, I knew when my due date was going to be, because I knew the weekend that we conceived. I keep up with eerything! LOL I plugged the conception date into the due date predictor.

Of course the Dr’s office was going by my last cycle. I let them think that, until I actually went in for my first ultrasound. The baby measured exactly where I thought that I was.

Also, you are supposedly 2 weeks pregnant before you actually conceive, so they add 2 weeks to how far along you are too.

Post # 7
6997 posts
Busy Beekeeper
  • Wedding: February 2011

You should be able to get a dating ultrasounds here shortly. I know doctors prefer to use LMP but actually if you know when you concieved you should be able to calculate that as well and it tends to be a little more accurate. I’ve been going by my LMP because my doctor does which gives me a due date of 1/7 but i know when we concieved and it calculates to 1/3 so we will see when baby gets here – it really not a huge difference anyway.. When i had gender scan baby was measuring right on track for due date of 1/5 but they didn’t change my due date as they think i will most likely go over anyway.

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