Implantation spotting or early sign of AF

Hi girlss.....

So this is my calender...last night after bd i experienced some pinkish blood in my discharge....i don't think it was caused by that because we took it really slow and passionate. I woke up in the morning with still a little pink spotting but it stopped after that....glow marked my expected aunt flo day on the 23....my question is can this be implantation bleeding or early aunt flo sign....i never experienced spotting on so much days before expected AF normally is the day before or the same day.