Hi I have almost 3 yo twin boys and had my dating scan today. There were 2 sacs with one of them…

Hi

I have almost 3 yo twin boys and had my dating scan today. There were 2 sacs with one of them showing a baby with heartbeat and the other had something inside but it wasn't a clearly defined fetal pole. I have to go back in 2 weeks to see if this baby is viable or not. I'm only 6.5 weeks and the technician said this one could just be behind. My boys always measured a few days apart as well.