i went for an ultrasound at like 5 weeks and 3 days at the hostpial because i had some bleeding but the baby fine.i only saw one sack.. but im just curious this probably sounds really stuipd, but I was wondering if there was a possibility that another sack could grow and I could have twins when I go back Friday for another one at almost 8 weeks please don't judge I'm a ftm and just wondering . twins run in the family