please, please, please help me! i'm going to lose my mind!!

here's my situation - i went off the pill in june. 30 days later i had my first period off the pill. (that was the last week of july the 25-28) so then 21 days later i had my next period (august 18-23) so that was more than a week early. so the 23rd was a week ago and today i felt like crap and came home tonight - laid down and went to the bathroom tonight and i'm bleeding again - just 7 days later. follow this?

what in the world? any ideas? since this just happened i haven't called my doctor but i have been in contact with him since going off the pill and he has told me it will take a while for me to get regulated but this seems ridiculous. before i was on the pill - i never had early periods like this.

last week i was at the doctor and had to take a pregnancy test for an operation i'm having next month and it was negative....

any words of advice?? PLEASE! PLEASE! PLEASE!