Feeling nervous

Little back story. I have 2 children already a 5 year old and an (almost) 3 year old. I have had one miscarriage between those two pregnancies. This year I had a missed mc in January at 10 weeks and then another mc after that. I have my first early ultrasound in a little an hour and this was when the baby stopped growing when I had my missed mc (took a couple weeks to catch it as I had no symptoms and my body wasn’t rejecting the dead fetus). So I’m nervous for today. I’m nervous things will be wrong again. The doctors office has me at 7w1d but I think I’m more 6w6d (I don’t have a 28 day cycle). Ughhhh so nervous.