Irregular period question

My period is very irregular and often skips completely. In July and Aug, it was normal and then in Sept I only had very light spotting for a week and no cramps which is the opposite of my norm and then back to normal period in Oct and just had the very light spotting with no cramps for a week again on Nov 11. I am curious if anyone else has experienced this. My husband and I just started TTC and I’m trying to figure out when I should test since I have no idea if/when I will even get a period in Dec. Thanks!