Brown Discharge at 8 weeks 5 days

Nicole • 21 yr old mommy to be November 2016!
So since yesterday around 7 pm I noticed brown discharge in my underwear. Not a whole lot but enough to need a panty liner. There's no clotting and no red, and I haven't been having severe cramps, just mild twinges here and there. Anyone else have something similar and everything turn out okay? I called my ob and they have me coming in at 4:30 to do a ultrasound and check on my baby. Prayers please tht everything is okay!!!