While waiting to see if anyone responding to my post, I spotted yours. It's been many years since I was pregnant, but some of your symptoms appear to be that you are pregnant. The tender boobs, the lightheadness, the slight cramping but no period. If you are going to be late, what is the latest you've been and still gotten your period? When you've gone beyond that point, take the test. The yellow discharge is something I'm not familiar with.