Piece of mind

Hi ladies. So, we found out yesterday that we are having twins and I shared the news with a few select people at work today, one of them being the girl I share an office with. She took it upon herself to tell me about vanishing twin syndrome, which I knew about, but didn't give a second thought to until now. Now my mind is racing and I can't stop thinking about it. The babies measured the same size 7 weeks 1 day and had heart rates of 142 & 152... I need some piece of mind and hoping to find it here. Thanks in advance :-)