Yaz pills

I was on the Yaz pills for I would say over a year but now I have been off of it since the end of Jan b/c my husband and I are TTC.  I never got any of the symptoms that these girls were talking about.  I mean I was moody around my AF time (but who isn't) and I was still getting the headaches the day before I would get AF.  The whole reason why the doc put me on Yaz was b/c of the headaches.  Well, anyway my question is when u come off the BC pills can it change your cycle.  I have been on BC for 10 years and I had a 28 day cycle but now I notice that I have a 24 day cycle and I get AF exactly when it is due to come.  Is this normal for the cycles to change like that or is it just my age?  I hope someone has a similar situation and can help me out and maybe I could help u out too.  Thanks for listening. :-)