tmi help

I had sex a few hours ago and just went to the bathroom. I wiped and there was barley a drop of blood on the tp. My period is due to start tomorrow. Has anyone else experienced this right before a period ? It was a very very tiny amount of blood . I havent gotten my usually af cramps that signal the start of my period. Another hour has passed and I haven't found anymore spotting. I just think this is really strange . My period usually just starts fully no spotting .