Hello I get my period every month same day, couple hrs boyfriend, as my best friend. My last period was on the 19th of August I usually go about six days. My ovulation calendar said I was suppose to get it on the 16th of September but I didn't and my best friend did. Five days went by no period.But on the third day I took a pregnancy test it was negative. Last night I urinated saw pinkish red very light traces of blood, so I put a tampon in. This morning when I took it out the tampon was dry except for a medium circle of dark red brown blood on one side. I've been experiencing cramping all day nothing strong enough for medication but then when I went to change my tampon and pee there was again the same thing on the tampon. What does that mean?