Hi Sylvie,
The pill is a pain in the butt. Loads of people have struggled massively to work out what/where their cycles are after coming off it - me included! Mine were regular for about 5-6 months, then went haywire, then went to 50 days, then last month was 58 days! I am taking Agnus Castus now to regulate them. It seems to be working as hopefully this cycle will be 12 days shorter than last.
Hopefully yours will sort themselves out too, it could be the added pressure of TTC is stalling AF? I had that last month...
Of course, the perfect solution would be that you have a shy BFP! Here's hoping that's what it is, everything crossed for you x