Brown discharge can either be very normal or a sign of something more serious. Sometimes it is just left over from your last period and it just comes out more slowly. This can also be a sign of early pregnancy. I know you said you took two tests but it is possible you are to early for it to show up on a htp.
However, brown discharge can also be a sign of something more serious like certain STDS, PID, or cervical cancer. But, when it is a result of these things you will have other symptoms as well, not sure if you are, but here is a helpful website you can read.
http://www.momswhothink.com/womens-health/brown-vaginal-discharge.html
Just relax until your appointment, hopefully your doctors will have some answers for you. Also, it is normal for a healthy women to take up to one year to conceive, i know that feels like forever but just be patient. Have you been tracking your ovulation days? If not you can go to wwwbabycentercom and they will give you all the days your are ovulating for like 6 months.. mark them on your calender and have sex on those days. Good luck.
You don't say what you want help with. The brown discharge? No can do on a website. The not being able to conceive? Most doctors won't even begin to do any workup for that until a year passes...and you are almost to the one year mark. Follow up with your GYN is the best possible answer...and you have that appt. Bravo!