If the vagina is dryer than usual could this be a sign of pregnancy?

Probably not. Your symptoms of pregnancy will usually appear anywhere from the first week of your expected period to 1-2 weeks after your first week of expected period. Your first signs of pregnancy most commonly include missed period, tender/swollen breasts, change in color of the breasts, fatigue, nausea/vomiting, increased sense of smell, and weight gain. Here is a link to a website that will calculate the probability of your pregnancy: http://www.thepregnancytest.com/