What point in cycle to come off mini pill? (Norethisterone)

[punbelievable]

I'm on noriday (norethisterone) and want to come off to start TTC.
All the pills are the same (i.e. no placebos and you don't take a seven day break on them) so I can't figure out when is the best time in my cycle to stop. Googling just gives me information about taking it to stop periods temporarily. I've been have regular periods on this pill ever 29/30 days so thinking to stop taking them on the day my next period starts?

Anyone else come off this particular pill and what was your experience?

I came off it a couple of days after my period ended, but only because I ran out and despite weeks of trying couldn't get any more from the manufacturer (we there thinking about trying for DC2 anyway). I had a light period again a few days later, but other than that nothing untoward. Probably doesn't help though, sorry...