I was advised by my endocrinologist when I came off the BCP that it takes 6 weeks for the hormones to get out of your system.

I had AF return 35 days after stopping the BCP, so my body may have taken a little less time.

Usual advice is to wait 3 cycles before TTC after coming off the BCP to make sure things have returned to normal. We waited the 3 cycles - and concieved on the third cycle but lost the baby.

Hope your TTC journey is a short and successful one!
Welcome to BB.
TICKLISH