Warning *TMI* Brown spotting / flakes in pee

I'm 7 weeks +3 days...Does anyone else have this? 
No cramping, just this brown flaky "blood"?! It's been happening since week 6...and I'm terrified everytime I use the restroom that a clot will just drop right out of me.
Had an early ultrasound last week, and we saw the sac...no baby yet. Dr. Said spotting was normal, but that I may miscarry.
Have another ultrasound scheduled for today, hoping to see baby and hear a heartbeat...but I just can't shake the feeling that this is just not ok.
Sorry for the graphic picture...but I'm just wondering if anyone else out there is experiencing this?