Hidden twin?

Peri

I was suppose to have an ultra sound today but was just given the fetal heart deal and I’m two days shy of 20 Weeks but measuring at 25. Provider told me it’s highly likely there’s another baby in my tummy looking back at my 1st ultrasound....looks like another sack. Anyone else have a hidden twin ultra sound? Can I see them. Omg I won’t know for sure til Friday 😂😭 omg idk what to think rn.