Dating ultrasound 2 weeks behind
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Your doctor calculates your stage of pregnancy or your gestational age using your last menstrual period.She will ask you when the first day of your last period was and from there, count how many weeks pregnant you are.
An ultrasound scan estimates your baby's age by measuring different parts of your baby's body such as her head, abdomen, and legs.In the second and third trimester, a difference in age of up to two weeks is considered normal between your gestational age and the ultrasound scan age.After all, your gestational age doesn't start from the actual day of conception but from your last menstrual cycle.For example, your anomaly scan may date your baby at around 19 weeks when your doctor considers you already 20 weeks pregnant.If this happens, your doctor will not be alarmed but she'll keep an eye on how your baby is developing in subsequent scans just to be sure that the difference in age doesn't increase.You may also find that your scan report indicates different ages for different body parts of your baby.
Your baby's legs might correspond to 21 weeks of pregnancy while her head might indicate 20 weeks.
This is completely normal as each baby has different proportions and grows slightly differently.
If all babies grew exactly the same way, all babies around the world would be the same height and weight when they were born!
If your scan reveals more than two weeks' difference between your gestational age and the scan age, your doctor will probably ask you to have another scan.
The difference could mean different things depending on what stage of your pregnancy you are in: First trimester A difference in age in your first trimester could indicate two things: In the case of a missed miscarriage or blighted ovum, there will also be no heartbeat.
Your doctor will ask you to get a second scan to confirm this and then discuss your next steps.