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The first trimester is defined as the first 13 weeks of pregnancy following the last normal menstrual period (some authors refer to early pregnancy as 0-10 weeks).It can be divided into a number of phases, each of which has typical clinical issues.These phases are: During the first trimester, the pregnancy progresses from a tiny gestational sac with no visible embryo, to an ~80 mm fetus with identifiable features and internal organs.An ultrasound is a procedure that uses high frequency sound waves to scan the pelvic cavity and abdomen of a woman, and then creates a sonogram (a picture) of the placenta and the baby.The terms sonogram and ultrasound are technically very different. An ultrasound exam can be performed at any point during the pregnancy period.The results of an ultrasound are immediately seen on a monitor when the procedure is being carried out.To diagnose molar pregnancies or diagnose a potential ectopic pregnancy, transvaginal scans may be performed during the early stages of pregnancy.

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In the early stages of pregnancy, ultrasounds are used to confirm a uterine pregnancy and fetal heartbeat.Ultrasounds that are performed during the later stages of pregnancy are used to screen for placenta location, umbilical cord and fetal growth.Later ultrasounds are also used to screen for the baby’s anatomy and general health.They are also used to check the length of your cervix when there is any suspicion that you might be in preterm labor.When to have your first scan depends on where you live and how your pregnancy is going.Below is the detailed timing and description of pregnancy scans in early pregnancy: When is it carried out: If you have experienced some problems such as bleeding in the first weeks of your pregnancy or you have previously suffered a miscarriage, you may be recommended to take an early scan.

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