I noticed last night after I got out of the shower stretch marks on my lower abs. I am not pregnant and my weight has stayed about the same. I did weigh more on the doctor's scale a couple months ago then on my scale at home. At the office it was 207 when I came home that day it was 196 at home. Now it is still 196 at home but my pants have been getting tighter. Is there any reason to gain weight down there- could stress cause this?