I have an app to help me keep up with my period and it also give me my fertile days and when Im ovulating. While I had my period on aug.4th-8th and my fertile days was 11th-15th I was ovulating on the 16th and me and my boyfriend had intercourse on the 11th, 14th and 15. I went to wipe myself yesterday which is the 16th and I was lightly bleeding(it pink not red). What does this mean this never happened before I'm scared.