Possible second loss 😔

In February, we lost a baby. At our first appointment at what was supposed to be 8 weeks, they could find only a gestational sac measuring around 6 weeks. I was told I would probably miscarry, but to come back in a week. We then saw a yolk sac and fetal pole and were cautiously optimistic. But 10 days later I started bleeding...Fast forward to this month, I got another positive test! We went to our first appointment last week when I was supposed to be 7 weeks. Same thing again 😔 No yolk sac, no baby. Just a gestational sac measuring 5 weeks...The doctor said not to worry too much, that my date may just be off and come back in two weeks. But I am SURE about my dates, I track everything in an app, so there’s no mistake....Has anyone had this happen, let alone twice?! Any happy outcomes?