Extremely Emotional

I know this sounds crazy but I dont know why I'm so emotional!! I never get emotional before my period (I do get cranky and irritable). I'm getting married in March, my workload isnt any different, my house of 3 kids and 2 dogs hasn't changed. I've been crying every night or at every video or picture or TV show. I can cry right now and I dont know why!! I have a great job, beautiful healthy family, just passed my last exams for my degree and a lot of positive going on right now. I have never been this emotional.