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Birth control pills may cause slight variation in the cycle and it is common to have irregular periods if you are on them.Usually periods occur when you are on the placebo pills as it is withdrawl bleeding due to the pills being not taken.
Periods might start soon in a week time.Relax and avoid stress as it may further delay the cycles.Consider taking the pills regularly for better efficacy and regular cycles.
If periods do not start even after 10 days then consider visiting a Gynaecologist for evaluation.
Take care!