Anyone else having mono mono twins?

I know mono monos are rather rare but hoping to find others out there to share their experiences! This is my first pregnancy (all natural) and we were surprised to find out we are having twins as no one down the lines in either of our families has ever had twins! Now that we know we are having a high risk set, it's even more overwhelming and I find myself terrified between appointments that something must be wrong. I'm 16 w 5 days today. Any advice would be amazing 😊