I have missed 3 months of my periods and my nipples are painful, ive done 4 test and a scan that shows nothing. why am i not receiving my periods?

Late period : 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. Since your tests are negative you now know you are not pregnant. Hormone testing can be done. There are many options available to help regulate the menstrual cycle. Schedule a visit.