My friend has been getting really weird periods since october. It keeps coming later and later. It lasts a shorter and shorter time. It went fom being 30 days apart and 7 days long to 38 days apart and 1 1/2 days long. She had a urine pregnancy test done at the doctor and it was negative. She also had all the symptoms of pregnancy. She is getting really frustrated and so am i. We are both naturally curious people and not knowing what is going on is bugging us both. Has anyone experienced this before? Could it just be a hormone imbalance?? If someone has some answers please reply.