Am a 18 ur old female about to turn 19 Ok my period are anywhere from 36-39 days of the first day of my last period. On June 20 i started spotting light pink blood which is day 33. It came early for me. 11,22,23 was about the say . 24,25 got a little bit more blood but this time a but red I filled out 2 panti liner on day 24. 26 turned pinkish light again. But yesterday it stop spotting and now my upper back hurts and am cramping. I took a dollor store pregnancy test and it came back negative. In the pregnancy box it said accurate results the day u miss ur period.