Ladies Help

Hope

I have a question do you have to fertile on the day it say to so your nut can catch the egg or not really cause i was going to start today or tomorrow!? And how long do it take your cycle to go back normal ?? Cause I had got mi birth control nexplanon took out on the 10 of last month, started the pills same day but I stop taken the pills on the 26 of last month, it bout be a hold month I being off birth control