My partner & I have been trying to conceive for 5 months now. My last menstrual period started on the 29.6.12 and ended a day early. My cycles are 31 days long, luteul phase is 16 days. We track the best fertility days through a period tracker, which as been spot on the last 6 months. I was due for my period on the 30.7.12, it is now the 1.8.12 and all signs of period is gone. I did a clear blue digital test yesterday which showed up negative, and an early first response this morning that showed negative also. Having a child is a very big thing for us, as we miscarried last year and have only just became ready again. It's practically torture to not get a period and still not know. Last time, my period was late by a few days but the pregnancy was detected very easily and early. When should I retest? Is there anything at all I can do?