Brown discharge at 7 weeks. Is this normal?

I’m about 7 weeks along and have had brown spotting on and off for a few days. Today however, it has gotten a little heavier (not very heavy just a bit more than spotting and a bit more frequent) but it’s still brown..sometimes light brown and sometimes dark brown. Is this normal? I’m going to my doctor tomorrow but I’m wondering if anyone else has had this experience?