TTC and confused!

Amber • Mummy to 2 little boy and 1 little girl!

I’m hoping someone can advise me, I’ve downloaded a few period/fertility trackers as we are TTC. I came off the Cerazette pill three days ago and we are TTC. I haven’t had my first period yet so don’t have a clue what I’m tracking so far because I’m still waiting to start. I aren’t even sure why I’m typing this, I think it’s reassurance but with my first I fell pregnant in 4 month, 3 of those we were DTD too many times I think as when we started tracking, we fell pregnant instantly. Same with my second, pregnant after a month of trying but I wasn’t on the pill this time for a good few months. My question is do you think I’m likely to fall pregnant quickly again or due to just coming off the pill will it take a while? Also, my first bleed since coming off be pill, do I class this as my first “period”?