I've had 2 very light period in the last 3 to 4 weeks lasting about 2 days took a home pregnancy test last month its negative what's wrong?

Bleeding: First, not all vaginal bleeding is your period. The most likely cause of spotting without a normal menstrual cycle is lack of ovulation. You are probably having some breakthrough bleeding from not ovulating. There are lots of causes of this and some simple blood tests can rule out the most likely causes. Your GYN might want to give you some provera (medroxyprogesterone) to bring your normal cycle back on too.

Irregular 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. There are many options available to help regulate the menstrual cycle. If you are trying to conceive the schedule a visit. Schedule a visit.