Did anyone only see one yolk sac before seeing twins?

I’m kind of a wannabe with twins. I thought I may be having twins bc my hcg was on the higher end of normal. At 5w3d (or 5w4d) I only saw a gestational sac and yolk sac. I thought that may spoil my twin chances. I had an early miscarriage the cycle before I conceived this pregnancy and was hoping I may be blessed with two. Twins run into my family but I’m likely out with the fraternal since there was only one gestational sac.

Interesting twin fact: My husband is an identical twin. I just posted this in a comment, but he was 8lbs10ounces when he was born and his twin was 8lbs8ounces. One was born vaginally, the second C-section. Their umbilical cords were in knots and it was wrapped around my brother-in-law’s neck. Crazy