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30 is a hormonal
pill containing ethinylestradiol
so it was prescribed to you by your doctor
.It does have few side effects nausea;vomiting;head ache;depression;weight gain;breast tenderness and even rise in blood pressure; cardiac problems;deep vein thrombosis.It is not to be used or you should stop immediately if you have developed high BP.One question is what is your age as this medicine is better avoided after age of 35 yrs due to the side effects.Since you have been on the pill for 8 months most likely your problem of periods might have been settled.So please stop the pill and consult your Gynaecologist if you get back the problem of your periods.