Whether or not it's too early to get side effects all depends on the person taking it. Some people are very sensitive to medications and get them right away. I am one of them. I have major depression, so I think that makes me more sensitive to mood side effects. I've never taken Yaz or Yasmin, though. However, I can tell you that birth control pills do deplete many of the B vitamins, and these are important for the mood. Try taking a B complex vitamin every day and see if that helps. If it doesn't, I would switch to something else. Good luck.