I am lost. i had normal ultrasound after six weeks preg. using iui the dr said normal sac. but no hb. he said hb can be seen at vaginal ult. at week 8?

Lui?: What's lui? Anyway, at 5-6 weeks menstrual age there is frequently only a yolk sac seen within the gestational sac. On vaginal imaging, fetal heart activity will usually be seen between 6-7 weeks. Try not to get too nervous but do bear in mind that up to 50% of all fertilized eggs fail to advance beyond the first trimester. If fetal heart is seen at 8 weeks there is a 98-99% success probability.