No heart no yolk?

Taylor

I am 6 weeks. Last week I went for an u/s and no fetal pole was to be found. Luckily, this week a fetal pole showed up but there has been no heart beat or appearance of yolk sack. I am scheduled to go back at the end of the week for another u/s to see if they have developed. I had an ectopic back in February, so my dr is monitoring me very close. Has anyone else experienced this? Did it turn into a viable pregnancy or abnormal?