NO!!!!!
I had a chemical in November. That cycle, I'd ov'ed on CD18. I normally have 33-day cycles. In fact, AF arrived on CD34 (16dpo), but by then I'd had 3 faint positives which turned to negative on the day AF arrived. That AF was terrible - very heavy, bad cramping, big clots.
Anyway, the next cycle, I ov'ed on CD14 and AF came on CD27. So I went from 33-day cycles to a 26-day one. The OPKs and CBEFM didn't work last cycle either.
This cycle, I'm now on CD18. No sign of ov - OPKs and CBEFM have been negative since CD9 (I started POAS early to make sure I caught it!). No EWCM. Fertility Friend is now suggesting I may have ov'ed on CD12, based on temps. That would give me a 24-day cycle with the same LP as last cycle. So - either I ov'ed really early this month, or I still haven't ov'ed and it's therefore a delayed ov this month. I have no idea. Whatever, it's pretty certain that my hormones are all over the place.
You can check out my charts if you like. Based on my experience - expect the unexpected!