So,I had sex on may 29th.I wasn't tracking my fertile days but I did notice I was late on my period by June 3. Then later that day,my period started.it lasted about 5 days so it ended about the 8th. Today is june 18th and just yesterday on June 17th I noticed a light flow of fresh blood,not enough to fill a tampon or pad but I can see it only when I wiped.I thought maybe it was a cut but it was inside my vagina and it wasn't a cut or bruise.I had no sex from the 30th until the 16th so what could cause this blood flow? I'm 27 years old and completely healthy with no illnesses. Please help!