Brown stringy discharge?

Lisa • 22 - Mommy to a beautiful baby boy ❤️ 8/30/16 👶🏻
I'm 7 weeks and 5 days I went for an ultrasound about two weeks ago and saw my baby's heartbeat. But this morning I wiped and saw stringy brown discharge (tmi) I got this when I was around 5 weeks and then went away. Now it happened again I have no pain or no cramps. But I'm worried any ideas? :(