When I returned for the second scan there were three heart beats. My boys are now three years old--yes, all three of them. If not
triplets, you may have twins--which is even better!
The fetal poles that were seen should have heart beats by the time you go for your next scan, If the third sac is not a sac, but rather a subchorionic hemorrhage, it should show some signs of resolution by your next scan.