Brown usually means old blood. Could just be a little bit of spotting. Have you had sex lately? Or internal exam? These things can irritate your cervix which can cause some spotting. It's fine. I spot every now and then.
Yes I've had this a few times in the past few weeks and just saw my midwife yesterday. She examined my cervix and didn't see anything wrong. We are pretty sure based on timing that it had nothing to do with sex (was feeling too sick the few days before it happened both times) and can't think of anything specific to attribute it to. Anyway, what she told me is that given that I have no other signs of problems (e.g., cramping or signs of early labor) there is nothing to worry about. So I agree with the others that you should check in, but also that's my 2 cents about how you probably don't need to worry
Re: Help
It's old blood, so could be from sexy time, or something irritating your cervix.
Either way, I would call your doctor and explain it to them.
Good luck.