Threatened miscarriage

I’m around 4 weeks pregnant.. I started bleeding heavy yesterday morning, I took a test and dark bfp. I took another this afternoon and still dark bfp. I got my beta checked monday and it was only 13, I got them checked yesterday and they almost tripled at 34... here is my test from yesterday and today. Should they still be this dark especially with my hcg levels starting off so low..

Yesterday

Today