Hi peanutter

I was also on the OCP for 10 years & I was expecting my cycle to takes ages to work itself out. But my first cycle was exactly 28 days & I think this cycle (my 2nd off the OCP) will be the same.
Like snowchickie, I can feel when I ovulate by having cramps for a few days beforehand. I am also using First Response ovulation predictor kit just for comparison sake & it's been spot on with what I suspect.
My GP told me that it really depends on how sensitive your ovaries were to the OCP, if you were very sensitive it will take longer to get into a regular cycle.
Hope this helps!!