Anggaran waktu subur tiap org x sme.. x smestinya hri ke 14 bru subur.. ade yg awal, ade yg lmbt.. sperm bley survive 5-7 hri dlm bdn kte, ovum plak bley survive 24-48 jam.. jd chances utk preggy tu ade even bsama sblum waktu subur..
usually tepat melainkan irregular period
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