I haven't had a normal period in 5 months but for the last 3, i have spotted for 1 day only once in the morning. have taken test all negative.

Irregular periods: Irregular periods are one of the most common problems obgyns treat. If this is one time problem it usually resolves on its own. If this is a recurring problem you should be evaluated. Infections & hormonal changes can cause spotting. If there is a concern for pregnancy then do a home pregnancy test . There are many options available to help regulate the menstrual cycle. Schedule a visit.

See an OB/GYN: Without having examined you or knowing what tests you have undergone and are "negative" there is no possible way to establish a diagnosis. Stick with your doctor.