Is it possible???

Is it possible to have ovulated 2 weeks late?? I went in to a free clinic and I’m supposed to be 8 weeks even today. When I had my ultrasound I measured 5 weeks 6 days and she could only see the yolk sac 😞 should I be worried??

This is my test today compared to 2 weeks ago, obviously my HCG levels have gone up. But I’m so scared of having a miscarriage 🙍🏼‍♀️