Light brown discharge- 8+2 pregnant

Hi ladies! I'm 8 weeks 2 days pregnant and have had some light brown discharge twice- both times after exercising. The exercise was NOT strenuous (25 minutes of Pilates), but I'm getting back to it after quite a long break. Of course, I'm worried it's not related to the exercise and the beginnings of miscarriage. It happened tonight and three days ago- nothing in between. No blood or even pink- just light tan/ brown and pretty stringy. Has anyone had this and went on to have healthy babies? Thanks!