it could be a pregnancy side effect, the hormonal levels in your body are over the roof. hormones affect almost all of our body's functions, so it could be.
here's a link that explain about rashes while pregnant (see if anything sounds familiar..) :
http://yourtotalhealth.ivillage.com/skin-rash-pregna... but there's always the chance that it's something else...so don't blame it on the pregnancy and ignore the rash. if it doesn't get better- check it out.
