Has it just happened the once or is it consistent for days on end? Do you have cramping? I had pink discharge at 6, 8,10 and brown discharge at 14 weeks. It was only the once when wiping. I found it peace of mind to ring my doctor/midwife when I had it just to get their input. Might make you feel better giving them a little phone. I hope it stops for you soon I know how worrying it can be x