40 days after menopause, B ultrasound can't see the pregnancy sac.

This condition may be that the baby is too young to see the gestational sac under B ultrasound. In addition, in one case, it is also necessary to rule out ectopic pregnancy. Therefore, it is best to check the blood concentration of chorionic gonadotropin after discovering this condition. If the normal development of embryos, the concentration of chorionic gonadotropin needs to increase exponentially after 48 hours. If this condition is not met, it may be necessary to consider ectopic pregnancy, so it is found that menstruation stops 40 days B ultrasound does not see gestational sac, first to do HCG examination, if doubling is good, you can continue to wait, wait a week later to do B ultrasound diagnosis.