Need hopeful stories of late (>18dpo) bfp after bfns

Mary
The number one sign of pregnancy is a missed period. If you get to 18dpo you really should be pregnant! My last 4 cycles gave peak opk at cd16 or 17, then af at 12 or 13dpo. This cycle was peak at cd17 and I'm now 18dpo and still bfns with fmu. My temps are still high. Please help me out with positive stories.