Pregnant after first month off BCP?

Nickey
Has anyone gotten successfully pregnant first month off their BCP? If so, how did you know? Did you chart or did it just happen? 
I've been having so much pregnancy like symptoms but don't know if/when I ovulated or if it's just pill withdrawal symptoms. 
AF isn't due until around the 28/29th according to Glow but not sure when it'll actually come due to being my first month off BCP after 7 years.