Bleeding after sex

My period ended over a week ago. Have been having sex since no bleeding at all so can't be the end of the period. Had sex the day before yesterday no problems. Had sex last night and only noticed afterwards that there was some blood. It was quite light and pinky not dark or bright red. It makes it a bit hard to tell though because obviously it's mixed with stuff from sex lol (TMI). The bleeding was only when I wiped really and there has been no more since. Is this something to be worried about?