Could my doctor be wrong about my due date?

Question

Here is a little back story to my question: 
I tend to have a longer cycles than most
 (33-36 days). My last period started on November 5th. When we first started trying to conceive, I took a Clearblue ovulation test that said I was most fertile on November 26th. Then we found out we were expecting on December 8th 😍 (FTM)
Fast forward to now: 
After downloading multiple apps (5 to be exact 😬) and taking multiple due date calculators online, they estimated my due date for August 17th. That would put me at 17 weeks 4 days. 
However, when I went to my doctors office, they gave me a due date of August 18th, but said I was only 16 weeks 3 days. 
Question: Could all these apps and online tests be wrong or could my doctor be wrong about how far along I am? When people ask me how far along I am, I don’t know what to tell them! Plus I like measuring how far along I am week by week. I’m so confused!

Answer

Apps give you an estimate assuming you ovulate 2 weeks after your period and have a regular 28-day cycle. Dating ultrasounds are the most accurate.

Answer

Well I’m 17 weeks 4 days and my due date is 8/12

Answer

My periods are 35 to 40 days apart my last period was nov 10th. My due date is aug 17 but they said 18th. You always go by what your doctor tells you. apps etc can be wrong because they tend to cater to the normal 28 day cycle. Even if you put in irregular periods, or days etc. Thats what your doctor is there for. Thats like your doc telling you something but you going home to use Google to treat yourself.

Answer

I ovulated on November 28/29 (I took temps and take ovulation tests) and I’m currently 16w 1d. You should go by ovulation date or your dating scan since your cycles are longer. Going by your last period would be off since it assumes you will ovulate 14 days after your period starts which isn’t the case for longer cycles.

Answer

You have completed 16 weeks of pregnancy and are currently in your 17th week. Like for me I am 15 weeks and 4 days pregnant due August 26th, I have completed 15 weeks and 4 days. Making me currently in week 16 on the 4th day but have not completed 16 weeks yet until Monday.

Answer

Im 16 weeks today and my due date is August 23rd, its just an estimate not everyone delivers on their due date. With my first my due date was June 19th i had her June 3rd, my second i was due December 23rd and i had her December 18th. So when im asked when am i due i just say August because im 100% sure i will deliver sometime in August before or after my due date. Just settle for the facts that you're 16 weeks and 3 days into your pregnancy and that you'll have your baby in August.

Answer

I was tracking very consistently. My positive was on December 10th (two days after you) and I am 16w today. Which times up perfectly with my temp spike and ovulation predictor kit. You’re likely 16+3.

Answer

Go by the whatever the ultrasound said which is most likely where the doctor got his info.

Answer

My lmp was November 5th and the doctors, ultrasounds and apps are all saying 8/12/

Answer

I’m due August 17th and I’m just now 17 weeks

Could my doctor be wrong about my due date?

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