Bete Periods ke shuruat mein inska aneemit hona swabhivik hai lekin baad mein yeh takreeban 28 se 34 dino ke antral pe hoti hai, jo ki har mahila ke liye alag alag hota hai.yadi aap chahein to ek vishehsgya se sampark kar sakti hain. https://lovematters.in/hi/resource/menstrual-cycle