Identical twins

I was told at I am carrying identical twins at 6weeks 5 days one baby has a heart beat and one doesn’t. My OB said that eventually one baby will vanish( the one that doesn’t have be heartbeat) and one will continue to grow. This makes me so nervous and confused. Is there a chance for this other baby to have a heartbeat at the next ultrasound?! Did anyone experience this before??? Is it safe to carry Identical twins?!?? I’ve been hearing lots of complications can happen I just want to hear some positive stories that people have went through or even if it’s not so good I just want to be prepared. This was such a shock to me as twins aren’t in my family and yes I know it’s not genetic bc they’re identical ( my embryo split). I would love to hear if any of you have had a similar situation. Thank you all!