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The type of pain you experience before your cycles , is normal , this is due to the hormonal
changes which happen just before the cycles start , this is known as symptoms of "premenstrual syndrome".The pain may continue till first two days of cycle and then slowly subside , this is known as dysmennorhea.
will be of great help at this time , avoid coffee, tea and stress
, also try yoga and meditation
If the pain continues for more than 3 days, you may need to see a gynecologist for an examination and an ultrasound
If your cycles are regular and no changes in flow , there is nothing much to worry