discharge help!

Caitlyn
Period was due Saturday. It never arrived so I tested Monday and got two BFPs. I tested again two more times Tuesday morning and got BFPs. However, I have had brown discharge each day and its worrying me that I'm going to miscarry. Tonight was the most brown liquid come out I'd seen yet. It's consistently been brown, not pink or red. I'm 4 weeks and 2 days and don't see the dr until Jan 31. Opinions needed. Thanks!