1. i missed my period 2. my walls of my vagina feel plump 3. I have been getting cramps for the past 3 weeks or so and I ve been waiting for my period, and i normally get thm a day before i start bleeding. 4. I took a pregnancy test a week ago and it was negative. 5. I have been having some syptoms of pregnancy like nausea, really tired, headaches, and my lower back and spine aches and feels hot inside. BUT i was sick with a cold for 3 days so im not sure. Could my periods be changing because its getting cold outside?