carried
If your cycle is irregular in nature it is likely that you are not ovulating regularly.
A "normal" cycle is a cycle length of between 21 and 35 days or with less than 4 days of variation from month to month. A 31-48 day cycle warrants further investigation.
Would suggest you forget all about using OPKs altogether (they are useless when periods are irregular anyway) and have a blood test done instead to see what your hormone levels are like. If these are awry such problems can be treated. You need to have a day 2 test done to measure and compare your LH and FSH levels. If these two hormone levels are awry then ovulation will be affected as a result.