I know how u feel yummy, we r now on cy #16 since beginning this

journey, with using the CBEFM, OPK's and great timing and I am slowly starting to loose hope aswell

.
I agree with Tkeys regarding the monitor, u should use it everyday without missing any days, that way the monitor gets to know ur cycle.
Another suggestion would also be, to try OPK's along with the monitor, that way, u know that u will be covered

.
GL for this cy anyway, I hope u catch that egg