Sometimes it is because yo are nervous so it's not coming on time. Many years ago one of my co-workers had the same problem and the doctor gave her medicine too. She didn't take it but after a couple days of seeing doctor, hers comes.

You don't have to take medicine but if you are worried, then you take, won't hurt you.

我以前没有结婚的时候一直晚那么久，最晚晚20天，后来结婚了，特别正常，非常准时28天就来，结婚一年以后又开始不正常了，妹妹不要太担心了，可能跟你的生活作息，以及饮食，压力相关的，稍微调养一下就好了

MM不用担心啦。刚结婚没多久那会儿，1连3个月都没来。刚过1个多月的时候怕是怀孕，自己拿试纸测，没有，可是不放心。到了2个多月的时候去医院查，没有，放心了。后来自己就来了，也没吃啥药什么的，关键心态放松了就正常了。

我这个认就特别敏感，心态一不好，马上就变了。