Doctors recommend: Safe period calculator, accurate contraception and pregnancy preparation, safe period calculator for women who are on contraception or preparing for pregnancy, simple and easy to use, clear at a glance~
The safety period is divided into a safety period before ovulation and a safety period after ovulation. The period from the day of menstruation to the first three days of ovulation is the period before ovulation. From the first day after ovulation to the day before the next menstrual cramps is the safety period after ovulation.
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