i had the same thing happen to me at the start of the year. i went off the pill had af straight away and then it was 5 months almost to the day before i got my next one.
the pill can really mess with your hormones and it can take a while for them to sort themselves out.
my dr just kept doing fsh and progesterone bt to see if i had ovulated.. turned out i didn't all that time.
after the 5 months i had af and about a 40 day cycle and now im down to 33 day cycle and im ovulating as well.
hope it all works out.