Yellow-orange discharge at 12+4

Lotte • Musician!
Dear all, I'm 12+4 today, I went out for a rapid ride on my bicycle and when I came back home I found some little yellow-light brown-orange discharge, just one time and then anymore. It was like mucus but the colour was strange! Now I'm feeling some cramps, last time I had them was several weeks ago. I never had any discharge since the beginning of my pregnancy, I made my us last monday and everything is going well. I wrote to my doctor and I'm waiting for her answer, what do you think about this little problem?