The months immediately after AF came after last 2 failed fresh cycles no ovulation.
In both cycles, I didn't even get to start OPK testing as I started mid-cycle spotting, thats why I would see Dr Loh.
He would do V-scan to check any cyst etc and at the same time, we found that no dominant follicle growing so confirmed no ovulation for these cycles. For both cycles where no ovulation, they were shorter cycles and my next AF came after CD27 and CD24 (usual cycle CD32 or 33).
If full AF doesn't come for prolonged periods, even just spotting, when no ovulation, may need to take progesterone pills, e.g. Nor-E to induce menses. If you are tracking BBT, a shift in BBT can indicate ovulation has occur and you may have missed your LH surge (doc said it is possible to miss LH surge if you have short or low LH surge). If you are not tracking BBT, you can wait till a few days after your usual cycle days for AF.
Don't worry too much as every time doc assure me it is indeed normal for the current cycle after a fresh cycle to be haywire. If there is abnormal bleeding or pain, consult doc to check it out. Otherwise, wait for AF while continue healthy diet etc.