Am I over thinking?

I was on the pill for 2 years. After last months period I stopped taking it as I wanted my body to start to regulate it's self.. 
My partner and I have sex quite often (unprotected) and my period is now 6 days late.. 
Do you think my cycle is now out of whack becuase I stopped taking the pill (this being the first month), or should I start thinking about a test?! 
My partner and I really would like kids which is why I stopped taking the pill, so my body could do its thing.. But I never expected this.