So I had my first sono today I had 1 single embryo transfer at 3 days. Today they saw 2 sacs on the sono I'm only 5 weeks. Of course I'm thrilled but then I had to go online and google and I am reading on so many sites that say how identical twins usually have 1 sac but can sometimes have 2. I'm just nervous now and have a million different scenarios playing in my head. Did any one here have an embryo split and clearly see two separate sacs on sono?