First cycle off BCP... AF barely came?

So, threw out the ol' BCPs and this will be my first cycle TTC, and I have always had a withdrawal bleed between pill packs. ALWAYS. This time, there was barely a bleed at all. Should this be any cause for alarm? I just want to make sure I'm not missing anything before we start trying this cycle. Any ideas? Had my yearly two weeks ago and doc says everything is perfect. Just can't understand why AF is taking a hiatus. I don't want her gone for THIS reason! :(