It's been 2 months now instead of periods. i am spotting pregnancy test came back negative last month. what is wrong?

Many things: Many things can do this. If the pregnancy tests are negative, it is very unlikely that you are pregnant. The low dose birth control pills often do this as do the progestin containing IUDs. Exercise, stress, and weight loss can also do it as can some other illnesses or drugs. If the periods are regular even if they are very light, it is not terribly serious. Talk with your doctor about what it is.