<prompt> Natural family planning method -AbstinenceCoitus interruptusBBTSafe period  <response>: Natural Family planning Methods Basal body temperature Depends on : Rise of temperature 0.3deg - 0.5degC at ovulation. Occurs due to : Increased progesterone production Cervical Mucus method Also known as Billing s Method or Ovulation method Based on changes in characteristics of cervical mucosa 1.At ovulation : Watery, clear, smooth, slippery, profuse like egg White 2. After ovulation : Thickens and lessens in quantity Symptothermic method Combines temperature, cervical mucus and calender techniques Ref: Park 25th edition Pgno : 559 