period problems from the pill…

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not sure if this is the right place for this topic, but i’m on the pill coz of roaccutane…

i only started using the pill (Yasmin) 3 weeks ago when i started Roaccutane, but it has been messing with my period and hormones… is this normal?
I had my period all normnal, a little less pain. and it stopped normally, but in the past 3 weeks, i have had 3 random days of light bleeding. And my breasts have been REALLY tender for the past 3 weeks… is this normal for someone who has just started on the pill… will my body stabilise sometime soon?