Dear Basira periods are irregular when they start, but sometimes it becomes irregular because of stress, tension and hormonal changes also. If you had an unsafe sex before and test reports shows negative, please consult a specialist or a registered doctor soon. One more thing is that Morning urine is best for samples for pregnancy test. Read here also: https://lovematters.in/hi/resource/menstrual-cycle https://lovematters.in/hi/our-bodies/my-periods-are-irregular-what-should-i-do If you would like to join in on a further discussion on this topic, join our discussion board, "Just Ask” https://lovematters.in/en/forum