怀孕和避孕的小知识 about pregnancy and contraception

这个视频介绍了日常生活中，关于怀孕和避孕的相关知识。
比较详细的介绍了排卵期的计算方法和测试方法。
希望对大家的生活有所帮助。
This video shows some tips on pregnancy and contraception .
The measurement method of ovulation time was introduced detailedly .
I hope this video is helpful .

怀孕,避孕,小知识,tips,pregnancy,birth control,ovulatory time,排卵期,