how accurate is a dating scan? - Pregnancy: Tips, Questions and Information - Essential Baby
The second one will be more accurate, that's why they don't usually do a dating scan unless after 12 weeks as dating before this us inaccurate. In short, no scans that late are not accurate for dating. why I should have a 13 week scan is if I would actually terminate the pregnancy if it. “My due date got put back by 2 weeks at the 12 week scan. “Scans are an accurate way to give you a due date,” confirms Nigel from the Society and College of.
Of course you have probably already used an online due date calculator. This is where you discover that your due date isn't based on the date you conceived, it's actually calculated from when your last menstrual period started your LMP. It's because it gives a definite date for health professionals to work with.
Wrong due date from ultrasound scan - why it happens | MadeForMums
There would be so many variables if it was calculated from when you think you conceived, especially as everyone's cycles are different and the fact that you don't necessarily conceive on the day you have sex! But this will only give you a rough idea. This is especially true if you have an irregular cycle or have been on the Pill for example. Experts say that the scan date can sometimes come out as less pregnant than suggested by your LMP. But then again with my first baby I was spot on with dates, he always measured big and he was a week overdue Babies are ready when they're ready - try not to worry easier said than done.
The healthcare professionals will stick to this date as far as possible because it is then used as the baseline for growth throughout pregnancy.
week pregnancy dating scan - NHS
Your baby's growth can slow down and then have spurts. I've not even had my 20 week scan yet.
I have scans every few weeks so it will probably keep on changing. Now, of course if she was dated 13 weeks and 1 day on March 25, that gives her a conception date of around January 6.
Sperm from the 21st would be pretty impossible. But as we know, ultrasounds at 13 weeks can be off 7 or 8 days, right?
Can your pregnancy scan give the wrong due date?
And sperm can survive for 7 days at most inside the woman. I'm just asking what you think the likelihood is that her ultrasound could have been off 9 days or more?
That's the worst case scenario: That would be just enough for the pregnancy to happen. The guy from Dec.WRONG GENDER!!! BABY ULTRASOUND.. HERE IS WHY ...
The guy after that would be a much better father and partner for her, if they chose to stay together. If it's important, they were sleeping together from around Christmas to the middle of January. He's the most likely one by far, but let's focus on the first guy's likelihood.
Obviously a paternity test would be the only way to know for sure, but we've been anxious as heck for 7 months.