Help with Diane ED 35 Birth Control Pill

I take the birth control pill Diane ED 35, and I am in my second month of using it. When it came around to take my first lot of sugar pills, I took them for two days and then went straight back to the active pills. I did this about 13 days ago, and for the last 11 or so days I have had my period. It is fairly light but still noticeable. Why is this happening, and will it go away within the next 6-7 days? Because I am so sick of it and really really can't have my period next weekend. It may be of note that the last pill I was on was Yasmin, and I had a period like this for the entire month that I took it, even though I took all the pills correctly, which was very frustrating!! As a result I went on this one. Anyways, thank you! I hope you can help.