First time mom

Please respect. Mga mommy safe po ba calendar method plus withdrawal? And ano app nyo sa calendar method? I am a cs mom and I have 16 months old baby. Gamit namin ni hubby condom plus withdrawal, pero againts sa simbahan any contraceptives. Dapat daw normal method(natural family planning) lang. (Kinumpisal kasi ni hubby so sabi nya bawal na condom) Basahin ko po lahat ng comment and suggestion mommies! Thank you!