Hmmm! bete yeh samsya kab se aa rahi hai? 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. Ok?. https://lovematters.in/hi/resource/menstrual-cycle