Anembryonic pregnancy

I had already 3 recurrent miscarriages for the last 3 years since 2015-2018. And it terrifies me. I had my first check up. I am 6weeks 4 days pregnant. But in my transv scan, I only had a gestational sac, no embryo. But my doctor is not losing any hope. I need to go back next week to follow up and we are praying hopefully she'll be able to see an embryo.? I dont know what to feel, I mean I cant explain what I'm feeling now. Like I feel nothing. Its just empty. But I dont lose hope.? I just wanted to ask, can the baby still grow? I mean is there any possibility? And I wanna know whats the cause of this problem. Because my doctor said, there might be an underlying sickness or something in my body.