My friend want to have a baby but her M is 勁唔準, e.g. 試過 ５月ＩＯ号 came and the next one came on ６月２８号. She tired many years but failed. She said she spent much on buying the
She asked me how to calculate her 排卵期 based on her 唔準既M. I don't know how to do so. Is someone can help? Thanks a lot.
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