Depo-Provera

Hello everyone, just wondered if anyone knows about the effects of Depo after stopping it or if anyone had a similar situation. I got the Depo-Provera birth control shot for two years, about a year ago I had my last shot, I did not have a period the whole time I was on it, I realize that's normal, In May I had my first one since stopping the shot, it was a very light period, The middle of June I thought I was going to have another one, but since about the 15th I've been having just spotting everday. I do have a doctor's appt. tommorow, but I wasn't sure how concerned I should be about this, I kept thinking it was just cause my hormones weren't back to normal yet, but it's been about a month.