I started my period Jan 22 it ended Jan 23 (kind of heavy) . That Wednesday I barely spotted & on Friday when I went to wipe myself I had an pinkish watery discharge.. Been cramping every since my period started on & off what could be wrong.. my cycles are usually 5 days long.. last had sex in early / middle december that period started of the 22 then stopped on 25th & started again & stopped at the end of the day.. ( not an very heavy ) . What could be wrong