7 weeks and brown blood?

has anyone else had this? I recently found out I was pregnant (with my 2nd) and have been having brown blood here and there...sometimes a tiny bit sometimes more but not enough to fill a pad or anything..

no cramps... doc. is set for this Tuesday... I got preggo 10months after our first was born and had an inverted T/classical cut c-section....

anyone else had something similar??