May 2nd I Was Waiting For My Period And Instead

May 2nd I was waiting for my period and instead I had brown/pink discharge for about 3 days. Then milky white the next day or two, and now the clear slimy discharge. I have headaches and tender breasts on and off, along with light cramping. Three home pregnancy tests were negative and a blood test May 10th negative. I don't know what to do besides wait a week then take another test because I feel I'm wasting money if I have really low hcg levels.