Looking for some hope, ultrasound photo

Hi everyone,
My story is that after four years of infertility (husband's side) I got pregnant via <a href="https://glowing.com/glow-fertility-program">IVF</a> for the first time in November, and had a very early miscarriage. I just completed my second full round of <a href="https://glowing.com/glow-fertility-program">IVF</a> and have been thrilled and terrified to be pregnant again. Today I had my first ultrasound at 5 weeks and 6 days, but they were unable to see the baby or the yolk sac at all. As you can see, it's just a big black hole. Anybody have any hope for me?  Has this happened to you and then you went on to have a happy, healthy nine months?  The doctor said it could turn out fine, but at this stage they'd at least expect to see a yolk sac.