My husband and I have been ttc for a short while now, if Glow is correct then I should have started my period yesterday on a 28 day cycle but I did not start nor have I had any of my usual signs such as sore breasts or cramping. I have taken about 6 tests in the past 2 weeks before my period due date and they were all negative so I'm afraid to take a test now with my hopes up and it to say negative... any advice? Should I wait a few more days? How will I know for sure if it's negative or if my period is just off this month for some reason?