I started a pack of pill in the middle of my cycle. I started on august 19 same time everyday. I had unprotected sex from aug 30-sep 2. My supposed 1st day of mens in on sep 4 but I dont expect to bleed since i am on pills. But i had a spotting the gone. I finish my pack on sep 8. I had withdrawal bleed last sept 13 but it was so light that after 1 day it was gone already. Am i pregnant? Why do i had spotting on sep 4 on the supossed 1st day of period.