Okay, I am on day five of my cycle, and I am suppose to take my femara on days 3-7. Well, today my cycle has been getting really light . .so I don't know if I am going to be on my period for seven days!! What should I do . .it is the weekend so I can not call my ob/gyn . .should I just keep taking femara until day seven even if my cycle has stopped!!!??!!