Add Yahoo as a preferred source to see more of our stories on Google. • A gestational sac is usually visible on a transvaginal ultrasound by 5 weeks of pregnancy or when hCG levels reach 1500 to 2000.

In a longitudinal study published in Scientific Reports, researchers investigate the effect of maternal physical activity on the size and growth of the yolk sac during early pregnancy. To this end, ...

Early pregnancy loss remains a common clinical challenge, prompting extensive research into methods for reliable prediction during the first trimester. Advances in transvaginal ultrasound have enabled ...