Hi , I've had a lumpectomy on my left breast on April 20, 2010. My last period,I started April 9....nothing since. I have done a home pregnancy test but it was negative. Its now May 16 and still no period. I don't feel any symptoms of being pregnant at all except i'm really hungry. would having the lumpectomy have maybe messed with my hormones? Just wondering. My periods have mostly been regular between 26-28 days this one is way way over that. Please any help would be appreciated.