Early Testing

My husband And I have been ttc for about 6 months now. I find my self getting bad anxiety around a week before my period and start testing every day to see if I'm pregnant. This month was different for me because I stated getting sore breasts ( also a sign of pms for me) as well as fatigue about two weeks before my period. I try so hard to not get myself worked up and get my hopes up and try to wait until the missed period but it's so hard. I tested with an early result test and it came back negative and I have been really down about it. I just don't know why I do this to myself. Does anyone else have this problem? What do you do to help relax and just let nature take its course?