Early pregnancy?

My tests are so dark, but they couldn’t see much on the ultrasound 2 weeks ago and then yesterday. I’ll go back again next week and waiting for my HCG levels.

I’m so nervous as to why they can’t see anything. I have no idea have far along I am, since I hadn’t had a period.. I started to loose weight and then instantly got pregnant. Has this happened with anyone? Doctors couldn’t see much on ultrasound but everything turned out ok?