Girls, when is the best time to start taking birth control pills?

My boyfriend will be back from military service in the last days of October. I decided to take birth control pills, just to be safe but I have no idea when to start taking them. When is the ideal time? Is it 2 months before or should I start 1 month ago? Does my period affect it, how can I arrange these?

Girls, when is the best time to start taking birth control pills?
Girls, when is the best time to start taking birth control pills?
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