Feeling Nervous - Dating ultrasound

I went today for my dating ultrasound. Per the 1st day of my last period I should be 8 weeks 3 days. The technician explained to me that I'm not measuring that far along, I'm measuring more about 5-6 weeks at most. My heart sank to say the least. I miscarried at 9 weeks a year and a half ago. When I spoke to my doctor later today we talked through what the technician stated, and I'm going to go for another ultrasound in a week to see if there is any progression of growth with the yolk sac. My Dr had said that based on the day I think I actually conceived, two weeks after my last period that could be more in line with where I'm measuring. It gives me hope. Has anyone ever experienced this before? It's going to be the longest week ever waiting to get that next ultrasound 😓 I'm trying to keep myself in a good headspace but I'm scared. I feel pregnant. Morning sickness, I've had sensitive nipples, all of a sudden some constipation, random fatigue. I really left like I was "on track" until that ultrasound today 😓