Urgent Rigevidon advice needed

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So i've been on Rigevidon (combined pill) since about January. I've been taking it correctly and I've never taken a pill more than an hour late. A few weeks ago I had a 'graduation' type thing at my school and I was determined not to be on my 7 days pill free (my period), so I just carried on into the next strip delaying my period. It's only the first time I have delayed my period, and this is the first month I haven't had one. This sunday I am suppose to stop taking it for my pill free week. I started bleeding yesterday (wednesday 21st may) and my friend informed me it was probably because my hormones had messed up. Now I am super scared that I could be pregnant because me and my boyfriend have had unprotected sex many times because the pill is 99% protective or whatever it is. Is there any chance that I could be pregnant? I've taken all pills correctly, the only thing I haven't done is had my pill free week for the last month. This is my question, sorry about all of the text...
Is there any reason for this bleeding, if so what is it and am I ok?
Is there any way I can be pregnant?
(I'm in the middle of my GCSEs i really don't need this). Any help I am grateful for. Thanks. xo

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thanks for the help, much appreciated (:

[Sanjivani Wanjari, MD]

Hi,
Rigevidon is a combined oral contraceptive containing 150μg levonorgestrel (LNG) and 30μg ethinylestradiol. As you have been taking the pills regularly, you are adequately covered. Also the pills are 99% effective. Hence the chances of pregnancy are less.
The bleeding you are having can be a period that has come earlier or it can be breakthrough bleeding. Consult your Doctor.
The answer is based on information provided. Exact advice is not possible without a proper examination and investigations. You are requested to consult your Doctor. Take care and keep us posted.