Brown discharge and test line getting lighter?!

💗louise💗 UK • Mummy to 1 prince and 2 princesses 💙💗💗 pregnant with our 4th little one our 2nd boy 🥰💙👶🏻 due January 2020
Hi, I had an early scan on Tuesday when I was 6 weeks and 2 days and seen my babe and heartbeat so I left really happy. Since then been having brown discharge and I have some cheap internet tests left so took one this morning and the line is lighter then it has been before? Anyone been through this? Thanks xx