brown watery discharge at 6 weeks 5 days

Stephanie
I'm starting to panick. I had a missed miscarriage back in August and I just found brown watery discharge in my underwear. I am traveling for work right now and I can't go into my doctor. This is exactly how my last MMC started and I have a bad feeling that this is the same situation. I did take a bath the night before, and I haven't had sex in a while... i have heard of implantation bleeding, but I always thought that was around 4 or 5 weeks... not almost 7. Has anyone been through this before? Can anyone give me advice or piece of mind? 
Thank you in advance