I have been trying for about 9-10 months now skipping probably 3 cycle every now and then. I have used opks and and ended up with bfn after my tww. I had ran out of opk strips and decided not to purchase any more. I have learned how my body work leading up to ovulation and the pattern of my cycle. I have decided to try this time without opks and I think I nailed it. I think I'm pregnant because all my symptoms now are different from that of pms. Waiting for my missed period which is in two days before I test .