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https://www.invitra.com/en/wp-content/uploads/2014/07/ultrasound-five-week-pregnancy.png24001020In the fifth week of pregnancy gastrulation takes place in the fetus, and then the baby's first organs begin to form. If an ultrasound is performed in the 5th week of pregnancy, the embryo sac can be seen, but the embryo cannot be seen and its heartbeat cannot be heard.