But then again with my first baby I was spot on with dates, he always measured big and he was a week overdue… these babies like to be tricky! Babies are ready when they’re ready – try not to worry (easier said than done).”īut Nigel also says that the estimated (and that is all it is) date is normally accurate plus or minus about a week. “My 1st scan with this baby put me 1 week earlier than I thought I was. The best time to establish this date is at the scan you are offered between 11 weeks and 2 days and 14 weeks plus 1 day,” Just how accurate (or not) can the dating scan be?Įxperts say that the scan date can sometimes come out as less pregnant than suggested by your LMP. “If the scan date differs from your LMP dates, then the scan dates will be used, but do discuss with your midwife if you are concerned. “Scans are an accurate way to give you a due date,” confirms Nigel from the Society and College of Radiographers. This is especially true if you have an irregular cycle or have been on the Pill for example.
But this will only give you a rough idea. Pregnancy normally lasts from 37 weeks to 42 weeks from the first day of your last period, explains NHS Choices. 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! Weird huh? It’s because it gives a definite date for health professionals to work with. 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). Of course you have probably already used an online due date calculator. It’s at this time that you will be told how many weeks pregnant you are. Unless you have an early pregnancy scan most of you will be given your estimated due date at the 12-week scan. “Then at my 12 week scan, they put me forward by 4 days.” When do you normally have a dating scan?
“I had an early scan at 8 weeks, which put me back a week,” adds AbnormalKitty.
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