First loss - how long until I start bleeding and pass the foetus

I started bleeding very small amounts of old blood on Tuesday an ulstrasound Wednesday confirmed I had lost the baby - I would be 12 weeks but the scan suggests I lost baby at 8weeks. I still havent started heavy bleeding (it’s now Saturday) the anticipation is awful. How long does it take?

My sister and I are so so close and we were both pregnant together with our first babies she had just had her 12 weeks scan yesterday she a beautiful healthy baby wriggling around her tummy I’m so so happy for her - but for me it’s hard to explain the hurt I feel