Accurate dating pregnancy ultrasound
My 12 week scan put me like 9 days ahead of my date using lmp!
My doctor calculates your LMP due date based on the actual amount of days in your cycle.
I have a 32 day cycle and by that, my LMP EDD was the 13th of December and my 12 week scan gave me an EDD of 12th December, so I'd say its pretty darn accurate My 12 wk scan put me a whole week ahead vs my lmp date.
My lmp is good, because I was keeping track, but I truly don't know when I ovulated, so yeah..moved my edd up a week and lo has been growing consistently within that week's size, so what do I know? The dating scan should be the most reliable, but end of the day you're talking maybe a maximum of 2 weeks discrepancy (which is rare anyway) and as a baby can come over a 5 week period there isn't a need to stress.
There was a really interesting article on the BBC about how some medical professionals think they should do away with the concept of a "due date" due to the 5 week window.
I would like to know the accuracy of ultrasounds in the first trimester. On Feb 2 I went off birth control for good & had withdrawal bleed on Feb 5-8.