The yolk sac is visible on a trans-vaginal ultrasound (done through vaginal route) by about five weeks of gestation, but it ultimately disappears as the baby grows. So, if one gestational sac shows a heartbeat (comes generally around 6 weeks), there was a viable or living fetus in that when you had the ultrasound.


The second gestational sac with only a yolk sac could either be due to delayed development or will not carry forward. Symptoms like ‘feeling really tired and sick for a few weeks and had white discharge’ are seen early in pregnancy and may or may not stay the entire period of the first three months.


In all probability everything is fine. A confirmation can only be done by your gynecologist or obstetrician and by a repeat ultrasound if required.
Hope this helps. Do discuss this with your doctor and get yourself examined. Take care!