Help with spotting/bleeding?

Okay so my lmp was 05/25/2011 and it ended around 05/28/2011 i`m on the pill and take it everyday same time, I was visiting my boyfriend from the 3rd of June until the 12th of June, I knew when i`d be ovulating, And ever since then i`ve had backaches, Slight cramping, Nausea, But its been awhile since i got home, And i spotted pink discharge on tuesday 05/14 and the day after it, It was a little heavier than spotting and bright red, And its continued until today, Its only when i go to the bathroom and wipe, I keep a pad on just incase and nothing transfers, So it isnt heavy, I was just wondering if i could`ve implanted the first day and have decidual bleeding now, My period is due wednesday, And all day today i`ve felt even more nauseous and sore. How likely is it that i`m pregnant? Also i had a PT done at my doctor and it came back neg. But she said to come back in about two weeks, And i wanna test now, Not because i`m anxious because i have a feeling to. So when do you think is a good time to test again? And should i be worried if it doesnt stop soon?