Discovering no heartbeat at 6 weeks of pregnancy can be deeply unsettling for expectant parents. While this moment often ...

4 “We know so little about the very early stages of human development,” said Nicolas ... and the hypoblast, or the yolk sac. When they tracked GFP expression, the team found that one population of ...

Gestational sac is well-shaped and in the uterus. Yolk sac (early nutrient source) is present. Fetal pole (early embryo structure) is visible. No symptoms like bleeding or severe cramping.