What do these things mean?!

Ashley
I was supposed to have my period Wednesday. It normally shows up the Wednesday of my menstrual week. Well it's now Saturday AM and I still don't have it. I have been having thick discharge (tmi?). My back aches, nipples (but not breasts) hurt, tummy is swollen, I'm tired a lot and I pee a lot. I don't want to waste money on a test of these aren't signs.....HELP!