My period date was 22 january. but still its not come. i checked pregnancy test before 4 days but its negative. whats meaning it is?

It happens sometimes: In a woman with regular periods, some causes of a late period include: excessive weight loss or weight gain, increased exercising, emotional stress, having an illness, traveling, medicines (such as hormone pills), hormonal imbalances, etc… Seeing a doctor is a good idea if symptoms are persistent, recurring, or worrisome. Home pregnancy tests are very accurate by 3 weeks after sex.