hi my fiance and i are tryin to have a baby..my last period was on the 23 thru the 28 of last month(a 31 day month)..i downloaded an ovulation planner application to my phone which told me that i was ovulating the 1-6 of this month..my fiance and i had unprotected sex the first, second, fourth and fifth during ovulation..6 days after ovulation i felt a dull cramping..felt bit of nausea..now on the 15, i am bleeding..it started out as a pinkish light color to a bright red to a darker red and i am cramping really bad, i could even feel pain in my lower back and my breast are slightly tender but i can only feel the pain when i push on them..i took a pregnancy test on the 14 in the late afternoon and it said i was not pregnant, it was negative, did i take the test too late in the day or is it too early for the test to detect the HCG..im reading alot about implantation bleeding but cant figure out if this is what it is..i dont usually keep track of my periods but now im starting to..according to the planner it predicted that my next period would be on the 20..therefore if this is my period why is it so early. and if it is not my period am i pregnant