Im 23 years old and in 2004 I had my tubes tied and about a month ago I had a leep biopsy done b/c I had abnormal tissue when I had my papsmear done...In September I had a normal 7 day period but In October I had a very very light period not even enough to wear a pad. I also took a pregnancy test yesterday and it was negative. So is my body just changing or is there a cause that I could be pregnant?