Twins?

Jessica🎀
I found out recently that I am pregnant with twins. Both in different sacs. But the one didn't have a fetal pole and they couldn't find the heart beat.  But with the other they found both very easily.  They have another ultrasound scheduled to see if the baby developed more or if it is not a viable pregnancy. Has any one else had this happen? What was your outcome? I am scared and confused.