What's happening?

I got my BFP almost 2 weeks ago, I've had scan already due to some slight bleeding but everything seemed fine and was no explanation for the bleed as nothing could be seen to indicate it. I was very early on 5weeks so only saw the sac with a yolk sac. I have a follow up on Monday to see if there has been any growth. However something in my head kept telling me to do another test so I've don't just that with a clear blue digital which came up with "not pregnant". I am completely baffled as last week it said 2-3. Have I lost my baby?