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Keep it with your maternity notes so your midwife and anyone else involved in your care can see it. This measurement, known as the crown rump length (CRL), is very accurate in the first trimester. How big your baby will be depends on when you have the scan: After 13 weeks, your baby can curl up and stretch out, so measuring the length becomes less accurate. It's helpful to know about twins early on, and it's easier to see whether or not they share a placenta during the first trimester. Finding out about having twins early in pregnancy also gives you more time to prepare for the birth and for your doctor and midwife to plan your care. Nearly all scans after 10 weeks can be done through your tummy, and most units ask you to arrive with a full bladder. You may need a second scan to check the first scan's findings.
Ultrasound scans are considered to be safe for you and your baby when performed by trained professionals.
Hormones in your blood vary according to your stage of pregnancy.
A blood test at what you thought was 13 weeks wouldn't be helpful if you were actually 16 weeks pregnant.
However, sometimes, having a scan can cause unnecessary worry.
It may show a very minor problem, or something that may get better on its own. onlinelibrary.[Accessed July 2017] Loughna P, Chitty L, Evans T et al. Fetal size and dating: charts recommended for clinical obstetric practice.