It looks like... she hasn't used this thing for ages?
The 19th of every month is her menstruation day. From the first time she had her period, her cycle always arrived on schedule, never disrupted by any weather or event.
In contrast, Xia Wan'an was different, her cycle was often delayed by ten days or half a month, which was a common occurrence, and occasionally, it would be delayed by a full month. During the coldest days in the winter, in severe cases, her delay could last up to two months.
Thinking about it, her 'aunt' didn't visit on the 19th of last month and another 19th is soon approaching. Although she wouldn't feel terribly uncomfortable during her period, she would still feel somewhat different. But now, with only two or three days left until the 19th, she doesn't have any episodes of chest tightness or abdominal discomfort at all.
The night with Han Zhijin was on the third of last month. Today, it has been almost forty-five days...
