Hi, Today After Sexual Arousal I Used The Bathroom And

Hi, today after sexual arousal I used the bathroom and there was a very tiny amount of light pink residue on the toilet paper. It was my 3rd time using a dildo that was a lot bigger than I am used to. The residue has only happened this time. It was also just that tiny amount, there has not been anymore. I did have sex on Oct 30 and I am not supposed to get my period until a week from Thursday. I have read online about implementation bleeding which is making me nervous. I've had no other symptoms besides an increase in acne which I typically get before my period. Should I be concerned about anything?