Hi erina. Welcome to BB.
I agree with the girls, think its leftover blood. Implantation blood wouldnt happen so quick. But if it does happen, dont be too concerned about what it looks like. My first one was brown and mucus like, where as this time it was bright pink and exactly like start of AF. I even rang the clinic and told them i was ready to start next cycle as AF had arrived. The diff. I think is, it only laated a VERY short time - a few drops really. GOOD LUCK!