I'm new to this so I hope I can explain everything correctly.

I was on birth control for 3 months (hoping it would help me conceive when I got off it) well after my first period off the pill I used an ovulation test kit so I know I was ovulating on 9-21-09 and my period is due the week of 10-5-09 but I started bleeding a week before that(this week) it stated out as a light flow but now it's a little heavier but nothing like a period, I've only been bleeding for 2 days and it's starting to slow down again. do you think it could be implantation bleeding or did I start my period early? I am so confused. I have also started having headaches, sore nipples and underarms, frequent bathroom visits, dizziness and cramping. Please help!