Our Third Trimester Ultrasound & Our “New” Due Date

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This blog post was written in May of 2017 when I was expecting my first baby, Graci. We hope that you enjoy this blog post about my due date and be sure to let us know what you think in the comments below.

On Wednesday, we got the opportunity to see our little Graci for the first time since our 18 week anatomy scan. (Read about that doctor appointment here.) Man, it was good to see her!

Since my boyfriend and I just moved from Seattle, Washington to Las Vegas, Nevada — we have had to do some catching up with our third trimester tests and help our new doctors to get up to speed with our pregnancy.

One of the major things that I had brought up to my new doctors was that I didn’t think my due date was correct. Ever since our first “official” doctor appointment, our due date was July 8, 2017. However, I didn’t feel like this was correct.

But, before we get into why I was sure my due date was incorrect, let’s chat about how doctor’s come up with your due date in the first place!

How Doctors May Determine Your Due Date

  • When doctors determine your due date, they typically count 40 weeks from your last period.
  • Then, as the pregnancy progresses, they determine whether this date seems correct or not by checking the baby’s growth during the ultrasounds.
  • Depending on how the baby is measuring, they may or may not change your due date.
  • Generally speaking, doctors factor in a buffer range for the baby’s measurements and your due date, meaning that as long as the baby measures within the range of your due date, they aren’t likely to make changes.

How Our Due Date Was Determined

When my boyfriend and I first saw an OBGYN, it was very early in our pregnancy. I had this weird intuition that I was pregnant before I ever got a positive test, so I tested EVERY DAY. Crazy, I know. As soon as I got that positive, I was all about making doctor appointments.

Anyway, at our first appointment, this doctor brought in an ultrasound machine. She took her own measurements of how big the baby was at that time.

Instead of going with the due date that would have aligned with my last period, she moved our due date to align with these initial measurements when the baby was teeny tiny, effectively moving our due date from June 22 to July 8.

She did this despite the fact that I knew for sure when I last had a period.

After a few hiccups with this initial appointment and generally feeling like we weren’t being listened to, my boyfriend and I determined that this doctor wasn’t a good fit for us and we changed doctors.

Our new doctor was someone we LOVED. As the pregnancy progressed, I had the ultrasounds and tests done and the baby continually measured ahead of the July 8 date. Whenever we would bring up the fact that we thought the due date was incorrect, it would be brushed off.

Our Due Date Changed, Finally

The topic of our due date started to really bother me the further we got into the third trimester. It didn’t make sense as I did more research about conception that our due date would be so far out.

So, when we transferred care, I brought the issue up again. Armed with the date of my last period and how the first doctor had come up with the date in my file, I was ready for the skepticism.

But instead…

Our new doctor listened to me.

In fact, he agreed that there was no hard evidence for our due date to be so far out and they officially changed our due date to June 22.

After having a bad experience with our first physician, it felt like a win to have our date changed. I felt like my doctor was actually listening to me.

A Note On Being Your Own Advocate

I feel a little embarrassed.


Because I should have pushed the issue and asked more questions about our due date sooner in the pregnancy.

I should have voiced my concern about the determination made by the doctor that we never went back to see.

I shouldn’t have let the conversation die off so many times.

I should have pushed my doctor’s to listen my data and why I thought the date was wrong.


Well, having the date your baby is due incorrect is one thing. It’s a pretty minor thing – especially when you’re only talking a difference of a couple of weeks. The baby is going to come when they want to, no matter what the doctor says about the date.

But, as a pregnant woman, sometimes you need to be your own advocate. While this particular issue was fairly minor, it could have been something far bigger.

So what have I learned?

You’ve got to make your voice heard. Your doctors should listen to you.

In all reality, they only see a tiny snippet of your pregnancy during visits. They don’t know your pregnancy like you do!

Mommas, have you ever had a similar situation? I’d love to hear from you below!

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