Pregnancy after Diane 35?

I have been on Diane 35 for about 2 years now (but on the pill in general for about 17 yrs). If I as much as missed one day of Diane, I had light breakthrough bleeding. I recently bled for a month straight (very light) so I stopped the pill (apx mid Aug). The bleeding stopped but my period has not come. No cramping, nothing. I know it might take some time for my body to get back to normal but in the past, missing one pill made me bleed. Or if I stopped the pill, I had what seemed to be a heavy period. The fact that nothing is happening has me concerned. Has anyone else experienced this on Diane 35?