14 weeks and spotting, anyone else had this?

I am a little over 14 weeks along. I had my son via csection in 2008. I thought the really mild acheyness was just the previous scar tissue but last night and the morning before I had some light brown tint to my cervical mucus. I had quite a bit of mucus last night tinted the light brown so I called maternity. She asked the usual questions if I had any exams the padt few days or sec, both answers being no. I'm not sure what could be causing this. I didn't experience this with my first. She said not to worry unless it persists or turns pink or red in color or unless I develop pain. Anyone else had this happen and what was the outcome?