For the past 3 months my periods have been very short, lasting 3 days. Normal days 5-7. The first day it is very heavy, but by the second day i can wear a pantyliner, it is so ligtht. Within the 3 months i have had, (on and off), terrible nausea, headaches, backache, dizzy spells, and a few weeks ago had sore breats (which lasted for a while). I have taken 3 pregnancy tests over this time and they have all been negative. I lost some weight at some point and have picked up again. At some point I even thought i felt some movement. I have 3 kids already, a 6yr old and 21 month old twins, and with both pregnancies i knew i was pregnant, before taking the test. Now i just feel 'odd'.