Is this normal

Zahra • Ttc baby #3 Yasameen 💖 2015 Aleena 💖 2017
Im 6 weeks pregnant and yesterday I had some brown mucus with no pain 
​I haven't got much symptoms either I've got tender breast tmi, frequent urinating and that's about it 
​My last blood test last week my hcg was 557 at 5 weeks is that a normal hcg for 5 weeks? The doctor didn't say anything about it, should I go to the doctor to get the brown mucus checked out it has stopped now but I'm very worried about miscarriage. I'm also getting an ultrasound done on Monday so I'm really hoping everything is okay.