In early pregnancy (about five to seven weeks), ultrasound may determine the size of the fetus to confirm the suspected due date, detect multiple fetuses, or confirm that the fetus is alive (viable).
No at all
It's not likely. The ultrasound might not even be able to detect a heartbeat yet. If you do see anything at all, it will be more like a little tiny dot!
An ultrasound of a fetus at weeks 16-20 of a pregnancy can be used to determine structural abnormalities
As soon as the embryo or fetus can be seen on ultrasound. Around 5-10 weeks a embryo, or fetus at 10 weeks, can be detected on an ultrasound and can show if the baby is in utero or if it's eptopic.
An ultrasound may be able to detect multiple embryos as early as your third week of pregnancy; However, the ultrasound will be most reliable at detecting a multiple or twin pregnancy at around 6 to 8 weeks.
From as early as 2 weeks after conception
Using transvaginal ultrasound, a fetus is detectable by ultrasound at around 5 weeks. Even a heartbeat can be detected.
as early a 5 weeks
You can usually tell by ultrasound at 20 weeks. But it is possible to see at 16 weeks if baby is corporative.
It means that the egg was fertilized 6 weeks ago