I was on the pill for 7yrs non stop. I even skipped sugar week. Literally non stop (id have sugar week 1-2 times a year).
I removed it on the 26th September. No withdrawal bleed. No sugar week. I was waiting around for ever thinking dont I have to get a period to start ttc. Negative.
I started OPK'ing because I couldnt be bothered waiting, It was more "just for fun". Get the TTC ball rolling .. make me feel like were TTC actively until my stupid AF arrived.
It never did... I was pregnant first go without getting a period or withdrawal bleed.
Can and does happen. Although VERY lucky. Remember it can take a few months to get your cycle showing some pattern but I personally dont believe you need to wait for your first period etc before trying.
I started taking vitamins from the day I stopped my pill.
All is going perfectly through my pregnancy so far.