natural family planning in which the fertile period is inferred from changes in the character and quantity of cervical mucus ovulation is marked by an increase in mucus that becomes sticky and then clearer and slippery
प्राकृतिक परिवार नियोजन जिसमें उपजाऊ अवधि चरित्र में परिवर्तन और गर्भाशय ग्रीवा बलगम ovulation की मात्रा से अवगत कराई जाती है