First day of missed period, still BFN :(

Looking for hope. Today is my predicted CD1 but I haven’t started. I’m on progesterone to lengthen my luteal phase. I’m 12DPO today. Yesterday I experienced what I thought were possible implantation cramps/twinges. I am just looking for success stories of people who received their first positives after 12DPO? Hanging on by a thread here.