How many weeks into pregnancy can you have an ultrasound?

Under normal circumstances, it is generally recommended to have the first ultrasound between 6 and 8 weeks of pregnancy, with subsequent scans scheduled according to the individual's pregnancy status and the doctor’s advice. Specific details are as follows:

At 6–8 weeks of gestation, an ultrasound can clearly visualize the gestational sac, embryo, and primitive cardiac activity. This helps confirm whether the pregnancy is intrauterine, determine if the embryo is viable, and estimate the precise gestational age based on the size of the gestational sac or crown-rump length, providing a foundation for future prenatal checkups. If performed too early—before 5 weeks—the embryo may not be sufficiently developed, making it difficult to clearly identify the gestational sac or heartbeat, potentially leading to misdiagnosis or the need for repeat scanning. If delayed beyond 8 weeks, critical conditions such as ectopic pregnancy or embryonic demise might be detected too late, delaying necessary interventions.

Subsequent prenatal ultrasounds should follow standard obstetric guidelines—for example, the nuchal translucency (NT) scan at 11–13⁺⁶ weeks and the detailed anomaly scan (often called the "anatomy scan") at 20–24 weeks, which screen for fetal chromosomal abnormalities and structural malformations, respectively.

The optimal time for the first ultrasound after conception is between 6 and 8 weeks of pregnancy. The exact timing should take into account menstrual cycle regularity and any physical symptoms, with a personalized examination plan established by the physician. Avoid scheduling scans earlier than recommended due to anxiety, and do not skip essential screening tests, to ensure scientific and safe monitoring throughout pregnancy.