Irregular Periods and Spotting

My husband and I just began the quest of baby making.  I have been off of the pill for about three months now and have been having irregular cycles.  My first cycle off the pill was picture perfect at 28 days.  My next cycle was 38 days and now I am in a 42 day cycle and I had light spotting on day 39 and 41.  I took a multiple pregnancy tests first thing in the morning and they all came back negative.  The question is, do I consider this spotting the beginning of a new cycle?  I just trying to figure out when I am going ovulate again so we can try to make a baby.  It is frustrating when my cycles are so long and irregular.  Thanks for your help in advance.  Not sure if I should be concerned that my cycles are soooo off especially if I am not pregnant.

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Try going to the store and getting some ovulation tests that might definitely help you on your quest.