Opinions??

So AF has never ever been any later than 2 days but I am now 5 days late. I have never experienced breast soreness/sensitivity as bad as it has been the last few days. I have been cramping for the last two weeks which when AF is about to make its appearance usually happens a week before. I also went on vacation across the country for about 6 days, could that have possibly thrown AF off?? I know I can test to make sure but honestly I'm a little scared to do so because I want this so bad and have been disappointed several times before. What do you guys think is going on??