Chu kỳ kinh nguyệt và cách tính ngày rụng trứng
(SK&ĐS) - Khi con gái vào tuổi dậy thì, ngoài việc e dè về sự đột ngột xuất hiện những thứ đáng ghét (ngực to, "viôlông" xuất hiện ở vùng kín...) thì những thắc mắc, những băn khoăn khó hiểu như tại sao lại có kinh, chu kỳ của nó ra sao, và làm thế nào để canh chừng ngày trứng rụng nhằm tránh những điều phiền toái sau này khi đã đi quá giới hạn yêu (quan hệ tình dục) với bạn trai... luôn thường trực trong suy nghĩ của các bạn. Chu kỳ kinh nguyệt là tập hợp các thay đổi sinh lý lặp đi lặp ...
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