Withdrawal Method

Hi moms and dads. Nung mag bf gf palang kami ng asawa ko today, withdrawal method lang kami. Tumagal naman ng 9 years na wala kami nabubuo. Pero nung mag asawa na kami, ayun sinadya na namin bumuo wala ng withdraw withdraw, 1 week lang buntis na. Ngayon plan namin na puro withdrawal lang ulit for three years since nagawa naman namin dati. However, medyo kinakabahan ako kasi baka may mabuo agad 4 months palang baby namin Survey lang. Sino dito nag wiwithdrawal method at gaano katagal bago kayo nabuntis (expected or hindi)?