Its prob coz you have just come off the pill and your body is still adjusting. I have been off the pill for 15months and my cycles are anywhere from 30-39 days!! some months i get cramps others i dont. I reckon, wait another couple of days and then go to your docs.
I have been doing some research and you can be pregnant without any symptoms...so the cramps and cravings you are having are prob due to your hormones. I am due on any day now and have had no cramps etc, but sometimes waves of sickness come and when i stand up i get all dizzy-who knows what those mean!?
Anyway, hope i helped!x