I am nursing a four month baby and had some bleeding 2 months ago but nothing since. I have been feeling sick to my stomache and have had light head aches for a few weeks off and on. I have taken a few negative pgernancy tests and I'm wandering what's wrong with me. I have been pregnant four times before and all my preg tests were positive within two weeks of conception. Any ideas? I am thinking I may have a hormone imbalence.