Sab knowledge k liye very much thanks...but ye samjhye ki koun sa date safe period hota hai kisi date k e.g. k saath...kya two time fillopion tube ka mouth khulta hai during 28 days me one period k just bad and next period aane k just pahle 3-3 days k liye??? Pegnancy time v/s safe time ko period calculator k e.g se plz explain karo..

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