Ultrasound measures vs LMP (When is my due date?)

Question

So I keep reading posts people saying that the ultrasound measurements are not accurate, so I just want share my “due dates” to see what you guys think:
1st day of my LMP was March 11... my cycles are an average of 30 days... so with information I would be 37w 4d and my due date would be Dec 18 
When I went to my first ultrasound, they said my due date was Dec 30 (I have been going by this date my whole pregnancy) 
Now, since week 30, I have had 2 more ultrasounds and they both said that the baby is measuring 2 weeks ahead (which would put me around Dec 18)... my fundal height is also measuring 2+ weeks ahead
So is my due date Dec 30 or Dec 18???

Answer

Due dates are never exact so I would just say anywhere between December 18th and 30th

Answer

They will likely not change the original due date that they assign you of December 30th. I am also measuring two weeks ahead and my last child was 11.7 pounds and they still won’t move my c section date up any earlier

Answer

LMP also 3/11, cycle always varies but was around 35 days during those couple months. Expected due date is 12/24.

Answer

It depends, are your cycles always 30 days? Or are they sometimes longer?
My last period was 15th march and my cycles are averaged out to every 30 days and my due date is the 22nd so by the lmp date you gave the 18th makes sense but like I asked if your cycles are sometimes longer then you could most definitely have been having a longer cycle that month and hence why you were given the due date of the 30th

Ultrasound measures vs LMP (When is my due date?)

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