Can 12 week dating scan wrong

When I first found out I was pregnant I worked out my own dates and then went doctor.The doctor confirmed I was pregnant and also the rough date is come up with which was around 4th FEB.You may need to have a full bladder for this scan, as this makes the ultrasound image clearer.You can ask your midwife or doctor before the scan if this is the case. Find out more about what happens during a pregnancy ultrasound scan.Not all units offer an early scan if all is going well in this pregnancy, though.Ask your GP if you want the reassurance of an early scan. The scan's main purpose is to work out accurately how many weeks pregnant you are and estimate your due date.Having a scan in the first few months of pregnancy can be a thrilling experience.

The person performing the scan is called a sonographer.You may have calculated the length of your pregnancy from the first day of your last menstrual period (LMP).This is even though you don't actually conceive until 14 days after your LMP, or later than this if your cycle is longer than 28 days.I was then very sick and suffered with hyperemisis and was admitted to hospital where they did an early scan which suggested I was only 8 weeks and my EDD was 2nd March. In the grand scheme of things, it really doesn't matter because the size of the baby won't determine whether or not he/she (sorry already forgot what was in the post) will be early or late.Which St the time threw me a little but I went with it. I questioned the consultant if my dates could be wrong and all I got was "possibly" or just a big baby. The earliest ultrasound is usually the most accurate for dating and around 8 weeks would usually be a pretty reliable bet.