I had similar cycles when TTCing DS's 1 & 3. Easy to tell in hindsight but at the time not quite so easy.
I think you'll find using mucous observations easier than temping for predicting O but using both together will help see a pattern.
Fertility friend has some great information but I found the best help for me was using the Billings Method as it's more detailed and not as temperature based.

If you want to try using the temp method then I would say to get a thermometer designed for it. I had a single decimal point one and I was missing the thermal shift as it was showing several days of 36.6 but then once I got the BBT 2 decimal point one they showed slight differences like 36.68 and 36.65 etc.