Weird period changes ...

Andrea
I'm 25 a mother of 2. My eldest is 5 and youngest is 2.5. I have always had regular cycles ever since I could remember. Now it seems I have been experiencing longer cycles and the days are either longer or short. The flow is a bit lighter not a whole bunch though. Recently married my husband and I have not been aiming for a baby but we do not prevent it as well. However for the past year I have seen my cycle go from 29 days to 33 tomissing an entire month to 36 days I'm lost at this point and now I'm currently 6 days late! What should be the next step I take with this ?!!? HELP!!!