it doesnt sound to bad but if you are concerned you should tell you doctor to get it checked better safe than sorry
You definitely need to call your OB and tell them.
I had brown spotting when I was about 10 or 11 weeks along. I called my doctor and she saw me the next day, checked my cervix and did an ultrasound to check on the baby. That is when we discovered that I had a low lying placenta. I was put on pelvic rest.
Brown discharge isn't as concerning as red discharge, but it still needs to be checked out. It could be a sign of your cervix thinning when it shouldn't or possibly an infection that needs to be treated (or like me, a low lying placenta).
I called my Ob & was given the option to do a blood draw to determine HCG. The spotting has slowed down so I am choosing to observe until my dr appt in a couple of weeks. I am having an ultrasound done then. If it continues or changes to a pink or red color, I am advised to call back. How is your pregnancy progressing?