Pink in toilet paper

Mama
I am 13 weeks, I went to the bathroom and had a barely visible amount of pink on the toilet paper. I freaked out and went to the ER, i know dramatic but my OB will not be open until Monday. They did an ultrasound and baby was bouncing around and everything looked great. I have used the bathroom again and again and no more pink.
However, I am worried out of my mind! Is this a miscarriage waiting to happen? Am I going to start bleeding more in the morning? 
I remember with my son I started spotting at 5 weeks but that seems more normal than at 13 weeks.