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排卵第四天,一条线。t区肉眼可见一条很淡的,啥意思,求解](http://img.haoyunbang.cn/newapp/4ebfe7e868b4251760c9155fef994923/2019-01-05/15466644959789.jpg?x-oss-process=image/watermark,text_5Zu-54mH5p2l5rqQ572R57uc77yM5aaC5pyJ5L615p2D56uL6ams5Yig6Zmk,color_FFFFFF,size_10)排卵第四天,一条线。t区肉眼可见一条很淡的,啥意思,求解