Good morning ladies plz help l went to an ultrasound on the 3rd of Feb…

Good morning ladies plz help l went to an ultrasound on the 3rd of Feb and there was 1 sac. I went back yesterday 24th of. Feb and they were 2 sacs, the doc ssid im carrying twins and im 8weeks preg.What worries me is that the other sac was bigger than the other, and the bigger one is empty whilst the small one it shows small thing inside..Do you think the bigger one will develop a baby or not , is it too early at 8weeks to see the fetus..the doc said i must come back after 2 weeks.