Late, Frustrating, & question

I just want to say my AF is three days late, have some symptoms but I really don't want to get excited over nothing. The day before I was supposed to start AF I took a test and it was a VERY faint line, but barley any color.. Its hard to get excited I just know I'm going to get my AF, just waiting. How do you ladies try and not get to excited if your late? We have been trying over a year and I get heartbroken every time I see someone on Facebook who announce they are pregnant.