Worried after first ultrasound - is there hope?

I had my dating ultrasound the other day and I was not expecting the news I got. When I went for my dating ultrasound with my first born, everything was smooth and healthy.

This time around, they said it didn't look I was as far along as I thought. I thought I was about 8-9ish weeks but I was looking more like 6ish weeks. So approx 2-3 weeks behind.

My midwife said there are signs of early pregnancy, a gestational and yolk sac but they couldn't detect the baby. She said it's common for women to get their dates wrong and I could just be earlier then I thought.

She said if I am truly 6 weeks she isn't worried about not finding baby as it's still a little early. She is sending me for a follow up ultrasound this Friday and bloodwork. This ultrasound would be about a week after this one so I'm PRAYING we see some progress and that we find baby.

I am SO worried. I haven't stopped crying.

I've heard this can go two ways, I can either see progress and baby will grow and be healthy or it could go to the worst case scenario which I don't even want to type out.

I'm sick to my stomach and feeling really depressed over this.

Can you ladies share your advice or experience with this - good or bad. I'm just looking for someone to talk to!